diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index a4aebe8b71..1c4d04da9d 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -147,6 +147,9 @@ test:mingw64:
   needs:
     - job: "build:mingw64"
       artifacts: true
+  variables:
+    # Windows runners don't have enough RAM to run EXPENSIVE tests.
+    GIT_TEST_LONG: false
   before_script:
     - *windows_before_script
     - git-sdk/usr/bin/bash.exe -l -c 'tar xf artifacts/artifacts.tar.gz'
@@ -195,6 +198,9 @@ test:msvc-meson:
   script:
     - |
       & "C:/Program Files/Git/usr/bin/bash.exe" -l -c 'ci/run-test-slice-meson.sh build $CI_NODE_INDEX $CI_NODE_TOTAL'
+  variables:
+    # Windows runners don't have enough RAM to run EXPENSIVE tests.
+    GIT_TEST_LONG: false
   after_script:
     - |
       if ($env:CI_JOB_STATUS -ne "success") {
diff --git a/ci/lib.sh b/ci/lib.sh
index 01a0bc6b75..6c52154eac 100755
--- a/ci/lib.sh
+++ b/ci/lib.sh
@@ -215,6 +215,7 @@ then
 	test macos != "$CI_OS_NAME" || CI_OS_NAME=osx
 	CI_REPO_SLUG="$GITHUB_REPOSITORY"
 	CI_JOB_ID="$GITHUB_RUN_ID"
+	CI_EVENT="$GITHUB_EVENT_NAME"
 	CC="${CC_PACKAGE:-${CC:-gcc}}"
 	DONT_SKIP_TAGS=t
 	handle_failed_tests () {
@@ -239,6 +240,13 @@ then
 	CI_BRANCH="$CI_COMMIT_REF_NAME"
 	CI_COMMIT="$CI_COMMIT_SHA"
 
+	case "$CI_PIPELINE_SOURCE" in
+	merge_request_event)
+		CI_EVENT=pull_request;;
+	*)
+		CI_EVENT="$CI_PIPELINE_SOURCE";;
+	esac
+
 	case "$OS,$CI_JOB_IMAGE" in
 	Windows_NT,*)
 		CI_OS_NAME=windows
@@ -319,9 +327,9 @@ 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.
-case "$GITHUB_EVENT_NAME,$CI_BRANCH" in
+case "$CI_EVENT,$CI_BRANCH" in
 pull_request,*|push,*next*|push,*master*|push,*main*|push,*maint*)
-	export GIT_TEST_LONG=true
+	export GIT_TEST_LONG=${GIT_TEST_LONG:-true}
 	;;
 esac