diff --git a/.github/workflows/prebuild-devcontainers.yml b/.github/workflows/prebuild-devcontainers.yml
index 794fa3d4a5..1825985c82 100644
--- a/.github/workflows/prebuild-devcontainers.yml
+++ b/.github/workflows/prebuild-devcontainers.yml
@@ -7,6 +7,8 @@ on:
       - '.github/workflows/prebuild-devcontainers.yml'
       - rust-toolchain.toml
       - Dockerfile
+    branches:
+      - master
   workflow_dispatch:
 
 concurrency: