diff --git a/CI/before_script.macos.sh b/CI/before_script.macos.sh
index 8d83949f09..f8c2c74169 100755
--- a/CI/before_script.macos.sh
+++ b/CI/before_script.macos.sh
@@ -1,4 +1,4 @@
-#!/bin/sh -e
+#!/bin/bash -e
 
 rm -fr build
 mkdir build