diff --git a/build-support/cleanup b/build-support/cleanup
index 06cb09a4dd..b52a942eb1 100644
--- a/build-support/cleanup
+++ b/build-support/cleanup
@@ -8,3 +8,9 @@ Nmakefile
 unmaintained
 build-support
 images
+factor.dll.exp
+factor.dll.lib
+factor.exp
+factor.lib
+libfactor-ffi-test.exp
+libfactor-ffi-test.lib