diff --git a/templates/.github/workflows/go-test.yml b/templates/.github/workflows/go-test.yml
index ceca1cb5..9270db70 100644
--- a/templates/.github/workflows/go-test.yml
+++ b/templates/.github/workflows/go-test.yml
@@ -29,7 +29,10 @@ jobs:
       - name: Run tests
         uses: protocol/multiple-go-modules@v1.2
         with:
-          run: go test -v -coverprofile module-coverage.txt ./...
+          # Use -coverpkg=./..., so that we include cross-package coverage.
+          # If package ./A imports ./B, and ./A's tests also cover ./B,
+          # this means ./B's coverage will be significantly higher than 0%.
+          run: go test -v -coverprofile=module-coverage.txt -coverpkg=./... ./...
       - name: Run tests (32 bit)
         if: ${{ matrix.os != 'macos' }} # can't run 32 bit tests on OSX.
         uses: protocol/multiple-go-modules@v1.2