diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e965b95e42acce88f071c426fdc12598dec07911..6fd07337c7d9b3e1a7c22a8e66580c9e5faabcac 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -99,7 +99,7 @@ jobs:
     downstream_tests:
         strategy:
             matrix:
-                downstream_project: [meshmode, mirgecom, arraycontext]
+                downstream_project: [meshmode, mirgecom, grudge, arraycontext]
         name: Tests for downstream project ${{ matrix.downstream_project }}
         runs-on: ubuntu-latest
         steps:
@@ -117,3 +117,7 @@ jobs:
                     python ../examples/simple-dg.py --lazy
                 fi
 
+                if [[ "$DOWNSTREAM_PROJECT" = "grudge" ]]; then
+                    mpirun -n 2 python ../examples/wave/wave-op-mpi.py --lazy
+                fi
+