diff --git a/ChangeLog b/ChangeLog
index 1f0d6557e1..6f5539a331 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Fri Jul 26 16:01:16 2002  WATANABE Hirofumi  <eban@ruby-lang.org>
+
+	* ext/extmk.rb.in (create_makefile): use Regexp in gsub.
+
 Fri Jul 26 14:31:06 2002  Yukihiro Matsumoto  <matz@ruby-lang.org>
 
 	* random.c: replace with Mersenne Twister RNG.
diff --git a/ext/extmk.rb.in b/ext/extmk.rb.in
index c5a929d4fe..71614c8b83 100644
--- a/ext/extmk.rb.in
+++ b/ext/extmk.rb.in
@@ -649,7 +649,7 @@ $(DLLIB): $(OBJS)
       else
         line.gsub!(/(\s)([^\s\/]+\.[ch])/, '\1{$(srcdir)}\2') if /nmake/i =~ $make
       end
-      mfile.printf "%s", line.gsub('\$\(hdrdir\)/config.h', '$(topdir)/config.h')
+      mfile.printf "%s", line.gsub(/\$\(hdrdir\)\/config.h/, '$(topdir)/config.h')
     end
     dfile.close
   end