diff --git a/action.yml b/action.yml
index 2f67433..5be41ee 100644
--- a/action.yml
+++ b/action.yml
@@ -115,9 +115,7 @@ runs:
           echo "$INPUT_SERVICE_ACCOUNT_KEY" > "$STACKIT_SERVICE_ACCOUNT_KEY_PATH"
         fi
 
-        export STACKIT_SERVICE_ACCOUNT_KEY_PATH
-
-        STACKIT_ACCESS_TOKEN="$(stackit auth activate-service-account --only-print-access-token)"
+        STACKIT_ACCESS_TOKEN="$(stackit auth activate-service-account --service-account-key-path "$STACKIT_SERVICE_ACCOUNT_KEY_PATH" --only-print-access-token)"
         export STACKIT_ACCESS_TOKEN
 
         STACKIT_PROJECT_ID="$INPUT_PROJECT_ID"