diff --git a/.github/workflows/modgc.yml b/.github/workflows/modgc.yml
index 3eaaf237f453a4..2324f694ab1584 100644
--- a/.github/workflows/modgc.yml
+++ b/.github/workflows/modgc.yml
@@ -24,19 +24,17 @@ jobs:
   check:
     strategy:
       matrix:
-        gc_name: ['default', 'mmtk']
         build: ['debug', 'release']
         mmtk_plan: ['MarkSweep', 'Immix']
         os: [macos-latest, ubuntu-latest]
         include:
           - test_task: check
-        # This matrix configuration will generate multiple 'default' GC jobs, but we only care about one
-        # So exclude all default "release" builds and all other plans except one.
-        exclude:
-          - gc_name: 'default'
-            build: 'release'
-          - gc_name: 'default'
-            mmtk_plan: 'Immix'
+            gc_name: mmtk
+          - test_task: check
+            gc_name: default
+            build: null
+            mmtk_plan: null
+
       fail-fast: false
 
     env: