diff --git a/src/compiler/emitter.ts b/src/compiler/emitter.ts
index eebbe302898..cd16074d572 100644
--- a/src/compiler/emitter.ts
+++ b/src/compiler/emitter.ts
@@ -814,6 +814,7 @@ namespace ts {
         function emitTypeParameter(node: TypeParameterDeclaration) {
             emit(node.name);
             emitWithPrefix(" extends ", node.constraint);
+            emitWithPrefix(" = ", node.default);
         }
 
         function emitParameter(node: ParameterDeclaration) {