diff --git a/bin/compose-core b/bin/compose-core
index 863e926..036e51d 100755
--- a/bin/compose-core
+++ b/bin/compose-core
@@ -679,7 +679,7 @@ get_service_type() {
 are_files_locked_in_dir() {
     local dir="$1" device hdev ldev
     device=$(stat -c %d "$dir") || {
-        err "Can't stat %d."
+        err "Can't stat '$dir'."
         return 1
     }
     device=$(printf "%04x" $device)