diff --git a/base/boot.jl b/base/boot.jl
index e7a851f99327c..3156c4ab99e7b 100644
--- a/base/boot.jl
+++ b/base/boot.jl
@@ -283,11 +283,13 @@ _new(:NewvarNode, :Symbol)
 _new(:QuoteNode, :ANY)
 _new(:GenSym, :Int)
 
-Module(name::Symbol=:anonymous, std_imports::Bool=true) = ccall(:jl_f_new_module, Any, (Any, Int32), name, std_imports)::Module
+Module(name::Symbol=:anonymous, std_imports::Bool=true) = ccall(:jl_f_new_module, Any, (Any, Bool), name, std_imports)::Module
 
 Task(f::ANY) = ccall(:jl_new_task, Any, (Any, Int), f::Function, 0)::Task
 
 # simple convert for use by constructors of types in Core
+# note that there is no actual conversion defined here,
+# so the methods and ccall's in Core aren't permitted to use convert
 convert(::Type{Any}, x::ANY) = x
 convert{T}(::Type{T}, x::T) = x
 cconvert(T::Type, x) = convert(T, x)
diff --git a/src/module.c b/src/module.c
index 9b0d821e6e9a2..6d8852565b498 100644
--- a/src/module.c
+++ b/src/module.c
@@ -36,7 +36,7 @@ jl_module_t *jl_new_module(jl_sym_t *name)
     return m;
 }
 
-DLLEXPORT jl_value_t *jl_f_new_module(jl_sym_t *name, int std_imports)
+DLLEXPORT jl_value_t *jl_f_new_module(jl_sym_t *name, uint8_t std_imports)
 {
     jl_module_t *m = jl_new_module(name);
     m->parent = jl_main_module;