diff --git a/dbms/src/DataStreams/LimitBlockInputStream.cpp b/dbms/src/DataStreams/LimitBlockInputStream.cpp
index ea794425bae..276f2c6ee41 100644
--- a/dbms/src/DataStreams/LimitBlockInputStream.cpp
+++ b/dbms/src/DataStreams/LimitBlockInputStream.cpp
@@ -143,7 +143,7 @@ Block LimitBlockInputStream::readImpl()
         }
     }
 
-    if (start + length == rows)
+    if (length == rows)
         return *ptr;
 
     for (size_t i = 0; i < ptr->columns(); ++i)