diff --git a/internal/kokoro/build_samples.sh b/internal/kokoro/build_samples.sh
index 63c449a..835ebcc 100755
--- a/internal/kokoro/build_samples.sh
+++ b/internal/kokoro/build_samples.sh
@@ -64,6 +64,8 @@
   go mod edit -replace cloud.google.com/go/pubsub=$gcwd/pubsub
   go mod edit -replace cloud.google.com/go/spanner=$gcwd/spanner
   go mod edit -replace cloud.google.com/go/storage=$gcwd/storage
+  echo "Downloading modules"
+  go mod download
   echo "Building module $i"
   go build ./...
   popd