diff --git a/src/ast/ast.cpp b/src/ast/ast.cpp
index aff05258d..f5e936939 100644
--- a/src/ast/ast.cpp
+++ b/src/ast/ast.cpp
@@ -1674,7 +1674,7 @@ bool ast_manager::slow_not_contains(ast const * n) {
 }
 #endif
 
-#if 1
+#if 0
 static unsigned s_count = 0;
 
 static void track_id(ast_manager& m, ast* n, unsigned id) {
@@ -1715,7 +1715,7 @@ ast * ast_manager::register_node_core(ast * n) {
 
     n->m_id = is_decl(n) ? m_decl_id_gen.mk() : m_expr_id_gen.mk();        
 
-    track_id(*this, n, 715);
+  //  track_id(*this, n, 715);
     
 //    TRACE(ast, tout << (s_count++) << " Object " << n->m_id << " was created.\n";);
     TRACE(mk_var_bug, tout << "mk_ast: " << n->m_id << "\n";);