diff --git a/Makefile b/Makefile
index 973ba1f3d4..ffcbf6364c 100644
--- a/Makefile
+++ b/Makefile
@@ -161,7 +161,7 @@ factor: $(DLL_OBJS) $(EXE_OBJS)
 
 clean:
 	rm -f vm/*.o
-	rm -f factor*.dll libfactor*.*
+	rm -f factor*.dll libfactor.{a,so,dylib}
 
 vm/resources.o:
 	$(WINDRES) vm/factor.rs vm/resources.o