diff --git a/ext/fiddle/extconf.rb b/ext/fiddle/extconf.rb
index c006439e6a..5cb638611e 100644
--- a/ext/fiddle/extconf.rb
+++ b/ext/fiddle/extconf.rb
@@ -140,7 +140,7 @@ types.each do |type, signed|
 end
 
 if libffi
-  $LOCAL_LIBS.prepend("./$(LIBFFI_A) ").strip!
+  $LOCAL_LIBS.prepend("./#{libffi.a} ").strip! # to exts.mk
   $INCFLAGS.gsub!(/-I#{libffi.dir}/, '-I$(LIBFFI_DIR)')
 end
 create_makefile 'fiddle' do |conf|