diff --git a/.github/workflows/go.yml b/.github/workflows/go.yml
index 09ad6facb..1eb75d0ea 100644
--- a/.github/workflows/go.yml
+++ b/.github/workflows/go.yml
@@ -28,6 +28,11 @@ jobs:
     - name: Test
       run: make check
 
+    - name: Regression tests
+      # We run these with a convoluted path to ensure the tests don't
+      # rely on a specific invocation
+      run: test/../mlr regtest -S
+
     - name: PrepareArtifactNonWindows
       if: matrix.os != 'windows-latest'
       run: mkdir -p bin/${{matrix.os}} && cp mlr bin/${{matrix.os}}
diff --git a/test/cases/dsl-local-date-time-functions/not-a-valid-timezone/experr b/test/cases/dsl-local-date-time-functions/not-a-valid-timezone/experr
index c86b0dfb3..fc9d9179d 100644
--- a/test/cases/dsl-local-date-time-functions/not-a-valid-timezone/experr
+++ b/test/cases/dsl-local-date-time-functions/not-a-valid-timezone/experr
@@ -1 +1 @@
-mlr :  unknown time zone this-is-not-a-valid-timezone-name
+${MLR} :  unknown time zone this-is-not-a-valid-timezone-name