diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index d8acfd8aa293a37b18d0af5c3a1f90ab0c65f0b4..2ca82010708849b20697a2e51c782adee042da3a 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -5,6 +5,7 @@ stages:
   - trigger
 
 cache:
+    key: "$CI_PIPELINE_ID"
     paths:
     - ${BUILD_DIR}
 
@@ -53,4 +54,4 @@ trigger_md:
   stage: trigger
   trigger:
     project: tadah/md
-    branch: $CI_COMMIT_REF_NAME
\ No newline at end of file
+    branch: $CI_COMMIT_REF_NAME