diff --git a/GNUmakefile b/GNUmakefile
index 4447dfbede..c4796de63b 100755
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -213,6 +213,8 @@ endif
 clean:
 	rm -f vm/*.o
 	rm -f factor.dll
+	rm -f factor.lib
+	rm -f factor.dll.lib
 	rm -f libfactor.*
 	rm -f libfactor-ffi-test.*
 	rm -f Factor.app/Contents/Frameworks/libfactor.dylib