diff --git a/win32/deps/zlib/build-x64.bat b/win32/deps/zlib/build-x64.bat
index 07de2c8e..d9bfa16e 100644
--- a/win32/deps/zlib/build-x64.bat
+++ b/win32/deps/zlib/build-x64.bat
@@ -25,6 +25,7 @@ nmake -f win32\Makefile.msc clean
 
 cd %ZLIB_DEST%
 set PATH=%PATH%;%ProgramFiles%\7-zip
+del ..\%PACKAGE_NAME%-x64.7z
 7z a ..\%PACKAGE_NAME%-x64.7z *
 cd %ZLIB_SRC%
 rmdir /q /s %ZLIB_DEST%
diff --git a/win32/deps/zlib/build-x86.bat b/win32/deps/zlib/build-x86.bat
index 5c94e851..d170a0bf 100644
--- a/win32/deps/zlib/build-x86.bat
+++ b/win32/deps/zlib/build-x86.bat
@@ -25,6 +25,7 @@ nmake -f win32\Makefile.msc clean
 
 cd %ZLIB_DEST%
 set PATH=%PATH%;%ProgramFiles%\7-zip
+del ..\%PACKAGE_NAME%-x86.7z
 7z a ..\%PACKAGE_NAME%-x86.7z *
 cd %ZLIB_SRC%
 rmdir /q /s %ZLIB_DEST%