diff --git a/CI/before_script.osx.sh b/CI/before_script.osx.sh
index a0dd1377a..e5ec8983b 100755
--- a/CI/before_script.osx.sh
+++ b/CI/before_script.osx.sh
@@ -17,5 +17,6 @@ cmake \
 -D DESIRED_QT_VERSION=5 \
 -D BUILD_ESMTOOL=FALSE \
 -D BUILD_MYGUI_PLUGIN=FALSE \
+-D BUILD_OPENCS=FALSE \
 -G"Unix Makefiles" \
 ..