diff --git a/c-opopt.cc b/c-opopt.cc
index d419afa..8aa7744 100644
--- a/c-opopt.cc
+++ b/c-opopt.cc
@@ -181,7 +181,7 @@ void T_OptData::buildControlFlowGraph(
 	T_AutoArray< T_StackEntry_ , 8 > stack;
 	T_Array< T_CallSite_ > callSites;
 	RP_CFN_ cNode{ nullptr };
-	visitor.visit( program.root , [&]( auto& node , const bool exit ) {
+	visitor.visit( program.root , [&]( A_Node& node , const bool exit ) {
 		const auto nt{ node.type( ) };
 
 		// Handle start/end of functions