diff --git a/src/util/virstoragefile.c b/src/util/virstoragefile.c
index 5c43665731..6870ae7c40 100644
--- a/src/util/virstoragefile.c
+++ b/src/util/virstoragefile.c
@@ -1525,7 +1525,7 @@ virStorageFileParseChainIndex(const char *diskTarget,
     if (virStringListLength(strings) != 2)
         goto cleanup;
 
-    if (virStrToLong_ui(strings[1], &suffix, 10, &idx) < 0 ||
+    if (virStrToLong_uip(strings[1], &suffix, 10, &idx) < 0 ||
         STRNEQ(suffix, "]"))
         goto cleanup;