diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index 84e67e6..1eaf2e9 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -9280,14 +9280,14 @@
         PyUnicode_READY(substring) == -1)
         return -1;
 
-    if (PyUnicode_GET_LENGTH(substring) == 0)
-        return 1;
-
     ADJUST_INDICES(start, end, PyUnicode_GET_LENGTH(self));
     end -= PyUnicode_GET_LENGTH(substring);
     if (end < start)
         return 0;
 
+    if (PyUnicode_GET_LENGTH(substring) == 0)
+        return 1;
+
     kind_self = PyUnicode_KIND(self);
     data_self = PyUnicode_DATA(self);
     kind_sub = PyUnicode_KIND(substring);