diff --git a/ci/lib.sh b/ci/lib.sh
index b939110a6e..e7a8942589 100755
--- a/ci/lib.sh
+++ b/ci/lib.sh
@@ -319,6 +319,7 @@ export SKIP_DASHED_BUILT_INS=YesPlease
 # enable "expensive" tests for PR events.
 # In order to catch bugs introduced at integration time by mismerges,
 # enable the long tests for pushes to the integration branches as well.
+test -z "$MSYSTEM" ||
 case "$GITHUB_EVENT_NAME,$CI_BRANCH" in
 pull_request,*|push,*next*|push,*master*|push,*main*|push,*maint*)
 	export GIT_TEST_LONG=YesPlease