diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index b9f3bb7..37cf75f 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -122,7 +122,8 @@ jobs:
       - name: Show Homebrew mbedtls prefix
         run: |
           echo "mbedtls is installed in: $(brew --prefix mbedtls)"
-          ls $(brew --prefix mbedtls)/include/mbedtls
+          ls "$(brew --prefix mbedtls)/include"
+          ls "$(brew --prefix mbedtls)/include/mbedtls"
       - name: build and run tests (OpenSSL)
         if: matrix.tls_backend == 'openssl'
         run: cd test && make