diff --git a/ChangeLog b/ChangeLog
index 21d39ddb3e..17686d1b0a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Fri Jan 29 12:59:33 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* configure.in (mingw): needs $(DEFFILE) for extension libraries.
+	  [ruby-core:27946]
+
 Fri Jan 29 11:09:49 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* lib/mkmf.rb (try_do): log no source when no developement env.
diff --git a/configure.in b/configure.in
index 791389f4b7..c28a9e8c3f 100644
--- a/configure.in
+++ b/configure.in
@@ -2181,6 +2181,8 @@ AS_CASE(["$target_os"],
 		LIBRUBY_SO='$(RUBY_SO_NAME)'.dll
 		LIBRUBY_DLDFLAGS="${LIBRUBY_DLDFLAGS}"' $(RUBYDEF)'
 	    fi
+	    EXPORT_PREFIX=' '
+	    DLDFLAGS="${DLDFLAGS}"' $(DEFFILE)'
 	    AC_LIBOBJ([win32])
 	    COMMON_LIBS=m
 #	    COMMON_MACROS="WIN32_LEAN_AND_MEAN="