diff --git a/src/compiler/transformers/es2017.ts b/src/compiler/transformers/es2017.ts
index 31aae5055a0..9c7bcf5b2ae 100644
--- a/src/compiler/transformers/es2017.ts
+++ b/src/compiler/transformers/es2017.ts
@@ -125,6 +125,7 @@ namespace ts {
                 visitNodes(node.modifiers, visitor, isModifier),
                 node.asteriskToken,
                 node.name,
+                node.questionToken,
                 /*typeParameters*/ undefined,
                 visitParameterList(node.parameters, visitor, context),
                 /*type*/ undefined,
diff --git a/src/compiler/transformers/esnext.ts b/src/compiler/transformers/esnext.ts
index f66bf14da53..2475e511196 100644
--- a/src/compiler/transformers/esnext.ts
+++ b/src/compiler/transformers/esnext.ts
@@ -541,6 +541,7 @@ namespace ts {
                     ? undefined
                     : node.asteriskToken,
                 visitNode(node.name, visitor, isPropertyName),
+                visitNode(node.questionToken, visitor, isToken),
                 /*typeParameters*/ undefined,
                 visitParameterList(node.parameters, visitor, context),
                 /*type*/ undefined,
diff --git a/src/compiler/transformers/ts.ts b/src/compiler/transformers/ts.ts
index 885f8fad898..bbc588ee9fe 100644
--- a/src/compiler/transformers/ts.ts
+++ b/src/compiler/transformers/ts.ts
@@ -2049,6 +2049,7 @@ namespace ts {
                 visitNodes(node.modifiers, modifierVisitor, isModifier),
                 node.asteriskToken,
                 visitPropertyNameOfClassElement(node),
+                node.questionToken,
                 /*typeParameters*/ undefined,
                 visitParameterList(node.parameters, visitor, context),
                 /*type*/ undefined,