diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index ce526b9d26a14a2f6fb96a02c8a4bc876c69858f..0105f1b4beb04b54589f26903b876b5b555ae147 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -93,7 +93,7 @@ build_macOS:
     - macOS
   script:
     - autoreconf -si
-    - './configure CXX=g++-10 CXXFLAGS=-static-libgcc'
+    - './configure CXX=g++-10 CXXFLAGS=-static-libgcc LEX=/usr/local/opt/flex/bin/flex YACC=/usr/local/opt/bison/bin/bison'
     - make -j$(nproc)
     - strip src/dynare-preprocessor
     - mkdir -p bin