diff --git a/src/Interpreters/HashJoin/HashJoin.cpp b/src/Interpreters/HashJoin/HashJoin.cpp
index 4f78243b09e..9a1bfe2d408 100644
--- a/src/Interpreters/HashJoin/HashJoin.cpp
+++ b/src/Interpreters/HashJoin/HashJoin.cpp
@@ -340,7 +340,7 @@ size_t HashJoin::getTotalRowCount() const
 
 void HashJoin::doDebugAsserts() const
 {
-#ifdef NDEBUG
+#ifndef NDEBUG
     size_t debug_blocks_allocated_size = 0;
     for (const auto & block : data->blocks)
         debug_blocks_allocated_size += block.allocatedBytes();