diff --git a/.github/workflows/test_ffi.yml b/.github/workflows/test_ffi.yml
index 678502cd..9fad99c4 100644
--- a/.github/workflows/test_ffi.yml
+++ b/.github/workflows/test_ffi.yml
@@ -66,4 +66,4 @@ jobs:
       - name: Run demes C example through valgrind
         if: matrix.os == 'ubuntu-latest'
         run: |
-           ./build/example demes/demes-spec/examples/browning_america.yaml
+           valgrind ./build/example demes/demes-spec/examples/browning_america.yaml