diff --git a/storage/innobase/buf/buf0buf.cc b/storage/innobase/buf/buf0buf.cc
index 4b0e1edd6c9..72f44ab9c32 100644
--- a/storage/innobase/buf/buf0buf.cc
+++ b/storage/innobase/buf/buf0buf.cc
@@ -1021,7 +1021,7 @@ buf_madvise_do_dump()
 		ret+= madvise(chunk->mem, chunk->mem_size(), MADV_DODUMP);
 	}
 
-	mysql_mutex_lock(&buf_pool.mutex);
+	mysql_mutex_unlock(&buf_pool.mutex);
 	return ret;
 }
 #endif