diff --git a/fmt-my-stuff b/fmt-my-stuff
index 8fc08d33b..e609c908f 100755
--- a/fmt-my-stuff
+++ b/fmt-my-stuff
@@ -9,4 +9,4 @@ fi
 BASE="$(readlink -f "$0" 2>/dev/null || python -c 'import os,sys;print(os.path.realpath(sys.argv[1]))' "$0")"
 BASE="$(dirname "$BASE")"
 
-grep -lr $1 $BASE/data/ | while read line; do utils/schema-check/dn42-schema.py fmt -i $line; done
+grep -lr $1 "$BASE/data/" | while read line; do utils/schema-check/dn42-schema.py fmt -i "$line"; done