diff --git a/.github/workflows/ruby.yml b/.github/workflows/ruby.yml
index 5912dbe..da44c0e 100644
--- a/.github/workflows/ruby.yml
+++ b/.github/workflows/ruby.yml
@@ -25,6 +25,9 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
+    - name: Shellcheck
+      if: matrix.os == 'ubuntu-latest'
+      run: shellcheck test/run test/checks
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with:
diff --git a/test/run b/test/run
index 26e5c00..08c6db9 100755
--- a/test/run
+++ b/test/run
@@ -103,4 +103,5 @@ function summary() {
 
 trap summary EXIT
 
+# shellcheck source=test/checks
 source "$(dirname "${BASH_SOURCE[0]}")/checks"