diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 704917c53..46752f44c 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -23,6 +23,10 @@ defaults:
     shell: bash
     working-directory: repo
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event_name == 'pull_request' && github.ref || github.run_id }}
+  cancel-in-progress: true
+
 jobs:
 
   build:
diff --git a/.github/workflows/msbuild.yml b/.github/workflows/msbuild.yml
index dd25c2669..fe148ad6e 100644
--- a/.github/workflows/msbuild.yml
+++ b/.github/workflows/msbuild.yml
@@ -22,6 +22,10 @@ defaults:
   run:
     working-directory: repo
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event_name == 'pull_request' && github.ref || github.run_id }}
+  cancel-in-progress: true
+
 jobs:
 
    windows: