diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index 16b9da4f5..f7a46a669 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -176,7 +176,7 @@ jobs:
   - script: |
       brew update
       brew install llvm libomp
-      make TARGET=CORE2 USE_OPENMP=1 DYNAMIC_ARCH=1 CC=/usr/local/opt/llvm/bin/clang NOFORTRAN=1
+      make TARGET=CORE2 USE_OPENMP=1 DYNAMIC_ARCH=1 CC="/usr/local/opt/llvm/bin/clang -arch x86_64" NOFORTRAN=1
 
 - job: OSX_OpenMP_Clang_cmake
   pool: