diff --git a/.gitignore b/.gitignore
index 034e85ae94c2817c9cb98521608f442f4361d154..de70dc9b9ec28f4e0cb15c42250df86b2139b334 100644
--- a/.gitignore
+++ b/.gitignore
@@ -53,6 +53,7 @@ src/tests/test_atomic
 src/tests/test_file_write_hole
 src/tests/test_file_lock
 src/tests/test_thread_pool
+src/tests/test_data_visible
 
 # other
 *.swp
diff --git a/src/connection_pool.c b/src/connection_pool.c
index ef1a6c3a0070470236388ba2fb29589ff79dd79f..5525c30169a2a553b8577ddee09915e0aa490919 100644
--- a/src/connection_pool.c
+++ b/src/connection_pool.c
@@ -57,7 +57,7 @@ int conn_pool_init_ex1(ConnectionPool *cp, int connect_timeout,
     if ((result=fast_mblock_init_ex1(&cp->node_allocator, "cpool_node",
                     sizeof(ConnectionNode) + sizeof(ConnectionInfo) +
                     extra_data_size, init_capacity, alloc_elements_limit,
-                    NULL, NULL, false)) != 0)
+                    NULL, NULL, true)) != 0)
     {
         return result;
     }