diff --git a/src/compiler/transformers/module/module.ts b/src/compiler/transformers/module/module.ts
index 11fb94693cf..9d811243718 100644
--- a/src/compiler/transformers/module/module.ts
+++ b/src/compiler/transformers/module/module.ts
@@ -510,7 +510,7 @@ namespace ts {
                 case ModuleKind.UMD:
                     return transformImportCallExpressionUMD(node);
             }
-            Debug.assert(false, "All supported module kind in this transformation step should have been handled");
+            Debug.fail("All supported module kind in this transformation step should have been handled");
         }
 
         function transformImportCallExpressionUMD(node: ImportCallExpression): Expression {
diff --git a/src/compiler/transformers/module/system.ts b/src/compiler/transformers/module/system.ts
index 45f515cda9b..2798c7ca2cc 100644
--- a/src/compiler/transformers/module/system.ts
+++ b/src/compiler/transformers/module/system.ts
@@ -677,7 +677,7 @@ namespace ts {
                         visitNode(node.body, visitor, isBlock)));
             }
             else {
-                hoistedStatements = append(hoistedStatements, node);
+                hoistedStatements = append(hoistedStatements, visitEachChild(node, visitor, context));
             }
 
             if (hasAssociatedEndOfDeclarationMarker(node)) {