diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 0079dd83685555ff9b96a35be8cf2106f27ee7b8..ba91c700d6ba8e105d8138f0c11aed4f706f7503 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_m
     - mkdir -p bin