diff --git a/mswin32/Makefile b/mswin32/Makefile
index 0a661e73c..e68d1a707 100644
--- a/mswin32/Makefile
+++ b/mswin32/Makefile
@@ -20,6 +20,7 @@ winbuild:
 	$(VCEXPRESS) nmap.sln /build release /log $(LOGLOC)
 	$(MAKENSIS) winpcap/winpcap-nmap.nsi
 	rm -rf nmap-$(NMAP_VERSION)
+	rm -f nmap-$(NMAP_VERSION)-win32.zip
 	mkdir nmap-$(NMAP_VERSION)
 	cd Release && cp -r ../../CHANGELOG ../../COPYING nmap-mac-prefixes nmap-os-db nmap-protocols nmap-rpc nmap-service-probes nmap-services nmap.exe nmap.xsl ../nmap_performance.reg ../../README-WIN32 ../nmap-$(NMAP_VERSION)/
 	cp -f OpenSSL/bin/*.dll ./nmap-$(NMAP_VERSION)/
@@ -33,7 +34,7 @@ winbuild:
 # Install the ndiff batch file wrapper in the zip distribution.
 	cp ../ndiff/ndiff nmap-$(NMAP_VERSION)/ndiff.py
 	cp python-wrap.bat nmap-$(NMAP_VERSION)/ndiff.bat
-	zip -r nmap-$(NMAP_VERSION)-win32.zip nmap-$(NMAP_VERSION)
+	zip nmap-$(NMAP_VERSION)-win32.zip nmap-$(NMAP_VERSION)
 # Remove ndiff.py and ndiff.bat for the installer because it has ndiff.exe.
 	rm -f nmap-$(NMAP_VERSION)/ndiff.py nmap-$(NMAP_VERSION)/ndiff.bat
 	cd ../zenmap && install_scripts/windows/copy_and_compile.bat