diff --git a/ci-build.cmd b/ci-build.cmd
index 0cc5386dee..c499f8f12e 100644
--- a/ci-build.cmd
+++ b/ci-build.cmd
@@ -20,6 +20,7 @@ CALL git clone --branch=%APPVEYOR_REPO_BRANCH% %REPO_URL% %DIST_SRC_DIR%
 cd %DIST_SRC_DIR%
 CALL git checkout %APPVEYOR_REPO_COMMIT%
 CALL git submodule update --init --recursive
+DEL /S %DIST_SRC_DIR%\.git\objects\pack\*
 cd %DIST_DIR%
 CALL 7z a browser-source-%APPVEYOR_BUILD_NUMBER%.zip %DIST_SRC_DIR%\*
 cd %APPVEYOR_BUILD_FOLDER%