diff --git a/.github/workflows/sync-tolk-grammar.yml b/.github/workflows/sync-tolk-grammar.yml
index 4f5cc0a..7821277 100644
--- a/.github/workflows/sync-tolk-grammar.yml
+++ b/.github/workflows/sync-tolk-grammar.yml
@@ -25,6 +25,7 @@ env:
 jobs:
   sync-grammar:
     runs-on: ubuntu-latest
+    if: github.repository == 'ton-blockchain/ton-language-server'
     permissions:
       contents: read