diff --git a/doc/jlatex/euslisp.hlp b/doc/jlatex/euslisp.hlp
index 3c0be3805..fae653835 100644
--- a/doc/jlatex/euslisp.hlp
+++ b/doc/jlatex/euslisp.hlp
@@ -184,47 +184,48 @@
 "boundp" 2 "jsymbols" 3711 3
 "fboundp" 2 "jsymbols" 4054 3
 "makunbound" 2 "jsymbols" 4181 3
-"get" 2 "jsymbols" 4388 3
-"putprop" 2 "jsymbols" 4585 3
-"remprop" 2 "jsymbols" 4719 3
-"setq" 6 "jsymbols" 4828 3
-"set" 2 "jsymbols" 5185 3
-"defun" 6 "jsymbols" 5385 3
-"defmacro" 6 "jsymbols" 5686 3
-"defvar" 3 "jsymbols" 5869 3
-"defparameter" 3 "jsymbols" 6133 3
-"defconstant" 3 "jsymbols" 6357 3
-"keywordp" 2 "jsymbols" 6885 3
-"constantp" 2 "jsymbols" 7013 3
-"documentation" 2 "jsymbols" 7143 3
-"gensym" 2 "jsymbols" 7262 3
-"gentemp" 2 "jsymbols" 7829 3
-"*lisp-package*" 4 "jsymbols" 11225 2
-"*user-package*" 4 "jsymbols" 11278 2
-"*unix-package*" 4 "jsymbols" 11339 2
-"*system-package*" 4 "jsymbols" 11394 2
-"*keyword-package*" 4 "jsymbols" 11458 2
-"find-symbol" 2 "jsymbols" 11518 3
-"make-symbol" 2 "jsymbols" 11774 3
-"intern" 2 "jsymbols" 11891 3
-"list-all-packages" 2 "jsymbols" 12245 3
-"find-package" 2 "jsymbols" 12347 3
-"make-package" 2 "jsymbols" 12462 3
-"in-package" 2 "jsymbols" 12735 3
-"package-name" 2 "jsymbols" 12874 3
-"package-nicknames" 2 "jsymbols" 12975 3
-"rename-package" 2 "jsymbols" 13054 3
-"package-use-list" 2 "jsymbols" 13331 3
-"packagep" 2 "jsymbols" 13423 3
-"use-package" 2 "jsymbols" 13510 3
-"unuse-package" 2 "jsymbols" 13773 3
-"shadow" 2 "jsymbols" 13886 3
-"export" 2 "jsymbols" 14030 3
-"unexport" 2 "jsymbols" 15257 3
-"import" 2 "jsymbols" 15407 3
-"do-symbols" 3 "jsymbols" 15819 3
-"do-external-symbols" 3 "jsymbols" 16047 3
-"do-all-symbols" 3 "jsymbols" 16246 3
+"fmakunbound" 2 "jsymbols" 4396 3
+"get" 2 "jsymbols" 4625 3
+"putprop" 2 "jsymbols" 4822 3
+"remprop" 2 "jsymbols" 4956 3
+"setq" 6 "jsymbols" 5065 3
+"set" 2 "jsymbols" 5422 3
+"defun" 6 "jsymbols" 5622 3
+"defmacro" 6 "jsymbols" 5923 3
+"defvar" 3 "jsymbols" 6106 3
+"defparameter" 3 "jsymbols" 6370 3
+"defconstant" 3 "jsymbols" 6594 3
+"keywordp" 2 "jsymbols" 7122 3
+"constantp" 2 "jsymbols" 7250 3
+"documentation" 2 "jsymbols" 7380 3
+"gensym" 2 "jsymbols" 7499 3
+"gentemp" 2 "jsymbols" 8066 3
+"*lisp-package*" 4 "jsymbols" 11462 2
+"*user-package*" 4 "jsymbols" 11515 2
+"*unix-package*" 4 "jsymbols" 11576 2
+"*system-package*" 4 "jsymbols" 11631 2
+"*keyword-package*" 4 "jsymbols" 11695 2
+"find-symbol" 2 "jsymbols" 11755 3
+"make-symbol" 2 "jsymbols" 12011 3
+"intern" 2 "jsymbols" 12128 3
+"list-all-packages" 2 "jsymbols" 12482 3
+"find-package" 2 "jsymbols" 12584 3
+"make-package" 2 "jsymbols" 12699 3
+"in-package" 2 "jsymbols" 12972 3
+"package-name" 2 "jsymbols" 13111 3
+"package-nicknames" 2 "jsymbols" 13212 3
+"rename-package" 2 "jsymbols" 13291 3
+"package-use-list" 2 "jsymbols" 13568 3
+"packagep" 2 "jsymbols" 13660 3
+"use-package" 2 "jsymbols" 13747 3
+"unuse-package" 2 "jsymbols" 14010 3
+"shadow" 2 "jsymbols" 14123 3
+"export" 2 "jsymbols" 14267 3
+"unexport" 2 "jsymbols" 15494 3
+"import" 2 "jsymbols" 15644 3
+"do-symbols" 3 "jsymbols" 16056 3
+"do-external-symbols" 3 "jsymbols" 16284 3
+"do-all-symbols" 3 "jsymbols" 16483 3
 "elt" 2 "jsequences" 584 3
 "length" 2 "jsequences" 968 3
 "subseq" 2 "jsequences" 1609 3
diff --git a/doc/jlatex/jsymbols.tex b/doc/jlatex/jsymbols.tex
index 1ccb041fc..61633e4c1 100644
--- a/doc/jlatex/jsymbols.tex
+++ b/doc/jlatex/jsymbols.tex
@@ -78,6 +78,10 @@ \subsection{symbol}
 {\em symbol}は、（特殊値を持たないように）強制的にunboundされる。
 ローカル変数は、いつも値が割り当てられ、{\bf makunbound}できない。}
 
+\funcdesc{fmakunbound}{symbol}{
+{\em symbol}に示される関数は、（特殊値を持たないように）強制的にunboundされる。
+ローカル関数は、いつも値が割り当てられ、{\bf fmakunbound}できない。}
+
 \funcdesc{get}{sym attribute}{
 {\em sym}のplistの中で{\em attribute}に関連する値を取り出す。
 {\tt (cdr (assoc {\em attribute} (symbol-plist {\em sym})))}と等価である。}
diff --git a/doc/latex/euslisp.hlp b/doc/latex/euslisp.hlp
index 44148cfbf..51f190257 100644
--- a/doc/latex/euslisp.hlp
+++ b/doc/latex/euslisp.hlp
@@ -184,47 +184,48 @@
 "boundp" 2 "symbols" 3325 3
 "fboundp" 2 "symbols" 3555 3
 "makunbound" 2 "symbols" 3653 3
-"get" 2 "symbols" 3842 3
-"putprop" 2 "symbols" 4016 3
-"remprop" 2 "symbols" 4134 3
-"setq" 6 "symbols" 4227 3
-"set" 2 "symbols" 4544 3
-"defun" 6 "symbols" 4690 3
-"defmacro" 6 "symbols" 4911 3
-"defvar" 3 "symbols" 5058 3
-"defparameter" 3 "symbols" 5277 3
-"defconstant" 3 "symbols" 5455 3
-"keywordp" 2 "symbols" 5869 3
-"constantp" 2 "symbols" 5964 3
-"documentation" 2 "symbols" 6067 3
-"gensym" 2 "symbols" 6154 3
-"gentemp" 2 "symbols" 6603 3
-"*lisp-package*" 4 "symbols" 9167 2
-"*user-package*" 4 "symbols" 9211 2
-"*unix-package*" 4 "symbols" 9255 2
-"*system-package*" 4 "symbols" 9301 2
-"*keyword-package*" 4 "symbols" 9350 2
-"find-symbol" 2 "symbols" 9393 3
-"make-symbol" 2 "symbols" 9595 3
-"intern" 2 "symbols" 9689 3
-"list-all-packages" 2 "symbols" 9990 3
-"find-package" 2 "symbols" 10063 3
-"make-package" 2 "symbols" 10171 3
-"in-package" 2 "symbols" 10376 3
-"package-name" 2 "symbols" 10512 3
-"package-nicknames" 2 "symbols" 10599 3
-"rename-package" 2 "symbols" 10675 3
-"package-use-list" 2 "symbols" 10909 3
-"packagep" 2 "symbols" 10995 3
-"use-package" 2 "symbols" 11055 3
-"unuse-package" 2 "symbols" 11251 3
-"shadow" 2 "symbols" 11355 3
-"export" 2 "symbols" 11476 3
-"unexport" 2 "symbols" 12371 3
-"import" 2 "symbols" 12510 3
-"do-symbols" 3 "symbols" 12848 3
-"do-external-symbols" 3 "symbols" 13030 3
-"do-all-symbols" 3 "symbols" 13191 3
+"fmakunbound" 2 "symbols" 3850 3
+"get" 2 "symbols" 4049 3
+"putprop" 2 "symbols" 4223 3
+"remprop" 2 "symbols" 4341 3
+"setq" 6 "symbols" 4434 3
+"set" 2 "symbols" 4751 3
+"defun" 6 "symbols" 4897 3
+"defmacro" 6 "symbols" 5118 3
+"defvar" 3 "symbols" 5265 3
+"defparameter" 3 "symbols" 5484 3
+"defconstant" 3 "symbols" 5662 3
+"keywordp" 2 "symbols" 6076 3
+"constantp" 2 "symbols" 6171 3
+"documentation" 2 "symbols" 6274 3
+"gensym" 2 "symbols" 6361 3
+"gentemp" 2 "symbols" 6810 3
+"*lisp-package*" 4 "symbols" 9374 2
+"*user-package*" 4 "symbols" 9418 2
+"*unix-package*" 4 "symbols" 9462 2
+"*system-package*" 4 "symbols" 9508 2
+"*keyword-package*" 4 "symbols" 9557 2
+"find-symbol" 2 "symbols" 9600 3
+"make-symbol" 2 "symbols" 9802 3
+"intern" 2 "symbols" 9896 3
+"list-all-packages" 2 "symbols" 10197 3
+"find-package" 2 "symbols" 10270 3
+"make-package" 2 "symbols" 10378 3
+"in-package" 2 "symbols" 10583 3
+"package-name" 2 "symbols" 10719 3
+"package-nicknames" 2 "symbols" 10806 3
+"rename-package" 2 "symbols" 10882 3
+"package-use-list" 2 "symbols" 11116 3
+"packagep" 2 "symbols" 11202 3
+"use-package" 2 "symbols" 11262 3
+"unuse-package" 2 "symbols" 11458 3
+"shadow" 2 "symbols" 11562 3
+"export" 2 "symbols" 11683 3
+"unexport" 2 "symbols" 12578 3
+"import" 2 "symbols" 12717 3
+"do-symbols" 3 "symbols" 13055 3
+"do-external-symbols" 3 "symbols" 13237 3
+"do-all-symbols" 3 "symbols" 13398 3
 "elt" 2 "sequences" 521 3
 "length" 2 "sequences" 854 3
 "subseq" 2 "sequences" 1335 3
diff --git a/doc/latex/symbols.tex b/doc/latex/symbols.tex
index 30304107d..30a89b6bd 100644
--- a/doc/latex/symbols.tex
+++ b/doc/latex/symbols.tex
@@ -87,6 +87,11 @@ \subsection{Symbols}
 Note that lexical (local) variables always have values assigned and
 cannot be {\em makunbound}ed.}
 
+\funcdesc{fmakunbound}{symbol}{
+{\em symbol} function is forced to be unbound (to have no special value).
+Note that lexical (local) functions always have values assigned and
+cannot be {\em fmakunbound}ed.}
+
 \funcdesc{get}{sym attribute}{
 retrieves {\em sym}'s value associated with {\em attribute} in its plist.
 {\tt = (cdr (assoc {\em attribute} (symbol-plist {\em sym})))}}
diff --git a/lisp/c/eus_proto.h b/lisp/c/eus_proto.h
index 5de3c9afe..01cbd97cc 100644
--- a/lisp/c/eus_proto.h
+++ b/lisp/c/eus_proto.h
@@ -586,6 +586,7 @@ extern pointer SYMBNDVALUE(context */*ctx*/, int /*n*/, pointer /*argv*/*);
 extern pointer SETFUNC(context */*ctx*/, int /*n*/, pointer */*argv*/);
 extern pointer SYMFUNC(context */*ctx*/, int /*n*/, pointer */*argv*/);
 extern pointer MAKUNBOUND(context */*ctx*/, int /*n*/, pointer */*argv*/);
+extern pointer FMAKUNBOUND(context */*ctx*/, int /*n*/, pointer */*argv*/);
 extern void set_special(context */*ctx*/, pointer /*var*/, pointer /*val*/);
 extern pointer SETSPECIAL(context */*ctx*/, int /*n*/, pointer */*argv*/);
 extern pointer DEFUN(context */*ctx*/, pointer /*arg*/);
diff --git a/lisp/c/specials.c b/lisp/c/specials.c
index 18df67935..2b61e17aa 100644
--- a/lisp/c/specials.c
+++ b/lisp/c/specials.c
@@ -1051,6 +1051,18 @@ pointer *argv;
   pointer_update(argv[0]->c.sym.speval,UNBOUND);
   return(T);}
 
+pointer FMAKUNBOUND(ctx,n,argv)
+register context *ctx;
+int n;
+pointer *argv;
+{ ckarg(1);
+  if (!issymbol(argv[0])) error(E_NOSYMBOL);
+#ifdef SPEC_DEBUG
+  printf( "FMAKEUNBOUND:" ); hoge_print( argv[0] );
+#endif
+  pointer_update(argv[0]->c.sym.spefunc,UNBOUND);
+  return(T);}
+
 void set_special(ctx, var, val)
 context *ctx;
 pointer var, val;
@@ -1330,6 +1342,7 @@ pointer mod;
   defun(ctx,"SYMBOL-BOUND-VALUE",mod,SYMBNDVALUE,NULL);
   defun(ctx,"SYMBOL-FUNCTION",mod,SYMFUNC,NULL);
   defun(ctx,"MAKUNBOUND",mod,MAKUNBOUND,NULL);
+  defun(ctx,"FMAKUNBOUND",mod,FMAKUNBOUND,NULL);
   defun(ctx,"SET",mod,SETSPECIAL,NULL);
   defspecial(ctx,"DEFUN",mod,DEFUN);
   defspecial(ctx,"DEFMACRO",mod,DEFMACRO);
diff --git a/lisp/comp/builtins.l b/lisp/comp/builtins.l
index ad16a3aa6..f16f4b88f 100644
--- a/lisp/comp/builtins.l
+++ b/lisp/comp/builtins.l
@@ -241,6 +241,7 @@
 (def-builtin-entry 'LISP::SYMBOL-BOUND-VALUE "SYMBNDVALUE")
 (def-builtin-entry 'LISP:SYMBOL-FUNCTION "SYMFUNC") 
 (def-builtin-entry 'LISP:MAKUNBOUND "MAKUNBOUND")
+(def-builtin-entry 'LISP:FMAKUNBOUND "FMAKUNBOUND")
 (def-builtin-entry 'LISP:SET "SETSPECIAL")
 (def-builtin-entry 'LISP:FIND-SYMBOL "FINDSYMBOL")
 (def-builtin-entry 'LISP:INTERN "INTERN")
diff --git a/lisp/l/eusstart.l b/lisp/l/eusstart.l
index 0c682fc67..006fe0c42 100644
--- a/lisp/l/eusstart.l
+++ b/lisp/l/eusstart.l
@@ -45,7 +45,7 @@
 		unwind-protect catch throw flet labels block return-from
 		return reset go tagbody evalhook macroexpand2 eval-when
 		the and or proclaim declare symbol-value symbol-function
-		makunbound defun defmacro find-symbol intern gensym
+		makunbound fmakunbound defun defmacro find-symbol intern gensym
 		list-all-packages find-package 
 		sxhash get export putprop))
 ;; makepackage ??
diff --git a/lisp/l/exports.l b/lisp/l/exports.l
index ef5a29800..ed13c9795 100644
--- a/lisp/l/exports.l
+++ b/lisp/l/exports.l
@@ -42,7 +42,7 @@
 		unwind-protect catch throw flet labels block return-from
 		return reset go tagbody evalhook macroexpand2 eval-when
 		the and or proclaim declare symbol-value symbol-function
-		makunbound defun defmacro find-symbol intern gensym
+		makunbound fmakunbound defun defmacro find-symbol intern gensym
 		list-all-packages find-package 
 		sxhash get export putprop))
 ;; makepackage ??