diff --git a/tools/build.sh b/tools/build.sh
index 1365b8838f44c4aeb2c23744534472bf17a92095..801bde9c1423b6d993218ebc3f475f7159b3838e 100755
--- a/tools/build.sh
+++ b/tools/build.sh
@@ -106,7 +106,7 @@ do
 	C) CREATE_OPT="$OPTARG"
 	   CREATE_DIRS=yes ;;
 	B) bootfiles="$bootfiles $OPTARG" ;;
-	\\?) usage
+	\?) usage
 	    ;;
     esac
 done