diff --git a/src/Interpreters/HashJoin/HashJoin.cpp b/src/Interpreters/HashJoin/HashJoin.cpp
index dfc41a93417..d1fa1280ed8 100644
--- a/src/Interpreters/HashJoin/HashJoin.cpp
+++ b/src/Interpreters/HashJoin/HashJoin.cpp
@@ -692,12 +692,12 @@ void HashJoin::shrinkStoredBlocksToFit(size_t & total_bytes_in_join, bool force_
 
     for (auto & stored_block : data->blocks)
     {
+        doDebugAsserts();
+
         size_t old_size = stored_block.allocatedBytes();
         stored_block = stored_block.shrinkToFit();
         size_t new_size = stored_block.allocatedBytes();
 
-        doDebugAsserts();
-
         if (old_size >= new_size)
         {
             if (data->blocks_allocated_size < old_size - new_size)