diff --git a/Nmakefile b/Nmakefile
index 1e6d3a0d42..6d9afa1aca 100755
--- a/Nmakefile
+++ b/Nmakefile
@@ -114,6 +114,7 @@ x86-64:
 clean:
 	del vm\*.obj
 	if exist factor.lib del factor.lib
+	if exist factor.res del factor.res
 	if exist factor.com del factor.com
 	if exist factor.exe del factor.exe
 	if exist factor.dll del factor.dll