diff --git a/src/services/formatting/formatting.ts b/src/services/formatting/formatting.ts
index 9f300f1db7a..412daaa8ab0 100644
--- a/src/services/formatting/formatting.ts
+++ b/src/services/formatting/formatting.ts
@@ -391,7 +391,7 @@ namespace ts.formatting {
             effectiveParentStartLine: number): Indentation {
 
             let indentation = inheritedIndentation;
-            var delta = SmartIndenter.shouldIndentChildNode(node, null) ? options.IndentSize : 0;
+            var delta = SmartIndenter.shouldIndentChildNode(node) ? options.IndentSize : 0;
 
             if (effectiveParentStartLine === startLine) {
                 // if node is located on the same line with the parent
@@ -490,7 +490,7 @@ namespace ts.formatting {
                             indentation -= options.IndentSize;
                         }
 
-                        if (SmartIndenter.shouldIndentChildNode(node, null)) {
+                        if (SmartIndenter.shouldIndentChildNode(node)) {
                             delta = options.IndentSize;
                         }
                         else {
diff --git a/src/services/formatting/smartIndenter.ts b/src/services/formatting/smartIndenter.ts
index 4477ea760bb..dfe94b3fdbb 100644
--- a/src/services/formatting/smartIndenter.ts
+++ b/src/services/formatting/smartIndenter.ts
@@ -471,7 +471,7 @@ namespace ts.formatting {
             return indentByDefault;
         }
 
-        export function shouldIndentChildNode(parent: TextRangeWithKind, child: TextRangeWithKind): boolean {
+        export function shouldIndentChildNode(parent: TextRangeWithKind, child?: TextRangeWithKind): boolean {
             if (nodeContentIsAlwaysIndented(parent.kind)) {
                 return true;
             }