diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 55d1b57180..ef67eb1409 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -104,7 +104,7 @@ jobs:
         run: ci/run.sh build
       - name: Rebuild dmd (with enabled coverage)
         if: matrix.coverage
-        run: ENABLE_RELEASE=0 ENABLE_DEBUG=1 ENABLE_COVERAGE=1 ci/run.sh rebuild
+        run: ENABLE_RELEASE=0 ENABLE_DEBUG=1 ENABLE_COVERAGE=1 ${{ runner.os == 'macOS' && 'OS_NAME=osx' || '' }} ci/run.sh rebuild
       - name: Test dmd
         run: ci/run.sh test_dmd
       - name: Test druntime