diff --git a/.github/workflows/osrm-backend.yml b/.github/workflows/osrm-backend.yml
index bfad0846572..389cb48586b 100644
--- a/.github/workflows/osrm-backend.yml
+++ b/.github/workflows/osrm-backend.yml
@@ -463,10 +463,10 @@ jobs:
         echo "CC=${CCOMPILER}" >> $GITHUB_ENV
         echo "CXX=${CXXCOMPILER}" >> $GITHUB_ENV
         if [[ "${RUNNER_OS}" == "macOS" ]]; then
-          # missing from GCC path, needed for conan builds of libiconv for example.
+          # missing from GCC path, needed for conan builds of libiconv, for example.
           sudo xcode-select --switch /Library/Developer/CommandLineTools
-          ls -al /Library/Developer/CommandLineTools/SDKs
           echo "LIBRARY_PATH=${LIBRARY_PATH}:/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/lib" >> $GITHUB_ENV
+          echo "CPATH=${CPATH}:/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include" >> $GITHUB_ENV
         fi
 
     - name: Build and install OSRM