diff --git a/src/dialog.c b/src/dialog.c
index 8eb01f1a..6b26aef8 100644
--- a/src/dialog.c
+++ b/src/dialog.c
@@ -275,7 +275,7 @@ ScanFiles(const char *dir, const char *prefix, unsigned acceptmask, unsigned dec
 						  de->d_name + prefixlen) == WANotFound) {
 					suffix = wstrdup(de->d_name + prefixlen);
 					if (sb.st_mode & S_IFDIR)
-						wstrappend(suffix,"/");
+						suffix = wstrappend(suffix, "/");
 					WMAddToArray(result, suffix);
 				}
 				wfree(fullfilename);