diff --git a/src/etc/rustup.sh b/src/etc/rustup.sh
index 4829e15fb0ffa..f73a0248c8516 100644
--- a/src/etc/rustup.sh
+++ b/src/etc/rustup.sh
@@ -188,7 +188,7 @@ flag() {
      fi
 }
 
-validate_opt () {
+validate_opt() {
     for arg in $CFG_ARGS
     do
         isArgValid=0