diff --git a/frontends/ast/ast.h b/frontends/ast/ast.h
index 923594a3c..b60cae247 100644
--- a/frontends/ast/ast.h
+++ b/frontends/ast/ast.h
@@ -467,7 +467,7 @@ namespace AST_INTERNAL
 	                           AST::AstNode *original_ast = nullptr);
 }
 
-#undef ASTNODE_GC
+#define ASTNODE_GC
 #ifdef ASTNODE_GC
 struct Tagger {
 	std::set<AST::AstNode*> nodes;
@@ -524,7 +524,6 @@ struct Tagger {
 		while (!copy.empty()) {
 			AST::AstNode* p = *(copy.begin());
 			copy.erase(p);
-			fflush(stdout);
 			if (!tagged.count(p)) {
 				shadow_kill(p);
 			}
diff --git a/frontends/verilog/verilog_frontend.cc b/frontends/verilog/verilog_frontend.cc
index 2e4ea9859..c798beff7 100644
--- a/frontends/verilog/verilog_frontend.cc
+++ b/frontends/verilog/verilog_frontend.cc
@@ -536,7 +536,7 @@ struct VerilogFrontend : public Frontend {
 			if (AST::AstModule* am = dynamic_cast<AST::AstModule*>(m))
 				Tagger::get().tag(am->ast);
 
-		Tagger::get().dump_untagged();
+		// Tagger::get().dump_untagged();
 #endif
 
 		if (!flag_nopp)