diff --git a/.github/workflows/build-simulators.yaml b/.github/workflows/build-simulators.yaml
index 38d7884a0..9b21d4b96 100644
--- a/.github/workflows/build-simulators.yaml
+++ b/.github/workflows/build-simulators.yaml
@@ -11,7 +11,7 @@ defaults:
     working-directory: ot3-firmware
 
 concurrency:
-  group: ${{ github.workflow }}-${{ github.ref_name }}
+  group: ${{ github.workflow }}--${{ github.ref_name }}
   cancel-in-progress: true
 
 jobs: