diff --git a/ChangeLog b/ChangeLog
index 6218bd0b8e..6eb152f88a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Thu Apr 11 10:39:34 2013  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* ext/fiddle/closure.c (USE_FFI_CLOSURE_ALLOC): add missing case:
+	  RUBY_LIBFFI_MODVERSION is not defined (usually on Windows).
+
 Thu Apr 11 09:27:04 2013  Konstantin Haase  <me@rkh.im>
 
 	* dir.c (file_s_fnmatch): Document File::FNM_EXTGLOB flag.
diff --git a/ext/fiddle/closure.c b/ext/fiddle/closure.c
index 1aab631aad..5439140649 100644
--- a/ext/fiddle/closure.c
+++ b/ext/fiddle/closure.c
@@ -13,7 +13,7 @@ typedef struct {
 #if defined(USE_FFI_CLOSURE_ALLOC)
 #elif defined(__OpenBSD__)
 # define USE_FFI_CLOSURE_ALLOC 0
-#elif RUBY_LIBFFI_MODVERSION < 3000005 && \
+#elif defined(RUBY_LIBFFI_MODVERSION) && RUBY_LIBFFI_MODVERSION < 3000005 && \
 	(defined(__i386__) || defined(__x86_64__) || defined(_M_IX86) || defined(_M_AMD64))
 # define USE_FFI_CLOSURE_ALLOC 0
 #else