diff --git a/flang/include/flang/Optimizer/Builder/FIRBuilder.h b/flang/include/flang/Optimizer/Builder/FIRBuilder.h
--- a/flang/include/flang/Optimizer/Builder/FIRBuilder.h
+++ b/flang/include/flang/Optimizer/Builder/FIRBuilder.h
@@ -50,8 +50,8 @@
 
   // The listener self-reference has to be updated in case of copy-construction.
   FirOpBuilder(const FirOpBuilder &other)
-      : OpBuilder{other}, kindMap{other.kindMap}, fastMathFlags{
-                                                      other.fastMathFlags} {
+      : OpBuilder(other), OpBuilder::Listener(), kindMap{other.kindMap},
+        fastMathFlags{other.fastMathFlags} {
     setListener(this);
   }