diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 1bed9c8d..d1bab239 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -54,8 +54,8 @@ build_macos_x86_64:
     - macOS
   script:
     - autoreconf -si
-    - './configure CC=gcc-12 CXX=g++-12 LEX=/usr/local/opt/flex/bin/flex YACC=/usr/local/opt/bison/bin/bison'
-    - make -j$(nproc)
+    - 'arch -x86_64 ./configure CC=gcc-12 CXX=g++-12 LEX=/usr/local/opt/flex/bin/flex YACC=/usr/local/opt/bison/bin/bison'
+    - arch -x86_64 make -j$(sysctl -n hw.ncpu)
   artifacts:
     paths:
       - src/dynare-preprocessor