diff --git a/System/Directory/Internal/C_utimensat.hsc b/System/Directory/Internal/C_utimensat.hsc
index 3d9b1942..cf2aeb34 100644
--- a/System/Directory/Internal/C_utimensat.hsc
+++ b/System/Directory/Internal/C_utimensat.hsc
@@ -12,7 +12,6 @@ module System.Directory.Internal.C_utimensat where
 #ifdef HAVE_SYS_STAT_H
 # include <sys/stat.h>
 #endif
-#include <System/Directory/Internal/utility.h>
 import Prelude ()
 import System.Directory.Internal.Prelude
 import Data.Time.Clock.POSIX (POSIXTime)
@@ -21,8 +20,7 @@ data CTimeSpec = CTimeSpec EpochTime CLong
 
 instance Storable CTimeSpec where
     sizeOf    _ = #{size struct timespec}
-    -- workaround (hsc2hs for GHC < 8.0 doesn't support #{alignment ...})
-    alignment _ = #{size char[alignof(struct timespec)] }
+    alignment _ = #{alignment struct timespec}
     poke p (CTimeSpec sec nsec) = do
       (#poke struct timespec, tv_sec)  p sec
       (#poke struct timespec, tv_nsec) p nsec
diff --git a/System/Directory/Internal/Windows.hsc b/System/Directory/Internal/Windows.hsc
index 1c723fb4..df11afff 100644
--- a/System/Directory/Internal/Windows.hsc
+++ b/System/Directory/Internal/Windows.hsc
@@ -12,7 +12,6 @@ module System.Directory.Internal.Windows where
 #include <shlobj.h>
 #include <windows.h>
 #include <HsBaseConfig.h>
-#include <System/Directory/Internal/utility.h>
 #include <System/Directory/Internal/windows_ext.h>
 import Prelude ()
 import System.Directory.Internal.Prelude
@@ -177,8 +176,7 @@ win32_alloca_REPARSE_DATA_BUFFER action =
   allocaBytesAligned size align $ \ ptr ->
     action (ptr, size)
   where size = fromIntegral win32_mAXIMUM_REPARSE_DATA_BUFFER_SIZE
-        -- workaround (hsc2hs for GHC < 8.0 don't support #{alignment ...})
-        align = #{size char[alignof(HsDirectory_REPARSE_DATA_BUFFER)]}
+        align = #{alignment HsDirectory_REPARSE_DATA_BUFFER]}
 
 win32_peek_REPARSE_DATA_BUFFER
   :: Ptr Win32_REPARSE_DATA_BUFFER -> IO Win32_REPARSE_DATA_BUFFER
diff --git a/System/Directory/Internal/utility.h b/System/Directory/Internal/utility.h
deleted file mode 100644
index 2f37ef34..00000000
--- a/System/Directory/Internal/utility.h
+++ /dev/null
@@ -1,6 +0,0 @@
-#if !defined(alignof) && __cplusplus < 201103L
-# ifdef STDC_HEADERS
-#  include <stddef.h>
-# endif
-# define alignof(x) offsetof(struct { char c; x m; }, m)
-#endif