diff --git a/build/scripts/build_cross_tools b/build/scripts/build_cross_tools
index 117e2428b4..e0b4cc04b4 100755
--- a/build/scripts/build_cross_tools
+++ b/build/scripts/build_cross_tools
@@ -1,3 +1,5 @@
+#!/bin/sh
+
 # parameters <haiku sourcedir> <buildtools dir> [ <haiku output dir> ]
 
 # get and check the parameters