--- contrib/libs/apache/arrow_next/cpp/src/arrow/filesystem/mockfs.cc	(index)
+++ contrib/libs/apache/arrow_next/cpp/src/arrow/filesystem/mockfs.cc	(working tree)
@@ -329,7 +329,9 @@ class MockFileSystem::Impl {
       return nullptr;
     }
     size_t consumed;
-    auto entry = FindEntry(parts.begin(), --parts.end(), &consumed);
+    auto last = parts.end();
+    last--;
+    auto entry = FindEntry(parts.begin(), last, &consumed);
     return (consumed == parts.size() - 1) ? entry : nullptr;
   }