diff --git a/releasetools/gen_uEnv.txt.sh b/releasetools/gen_uEnv.txt.sh
index 1e012f998..a805ef5a0 100755
--- a/releasetools/gen_uEnv.txt.sh
+++ b/releasetools/gen_uEnv.txt.sh
@@ -41,7 +41,7 @@ do
 	esac
 done
 
-function fill_cmd(){
+fill_cmd() {
 	#load == load method like fatload mmc 0:1
 	#prefix is an optional directory containing the ending /
 	load=$1