diff --git a/src/compiler.ts b/src/compiler.ts
index 08d25afff7..9d8bd7838d 100644
--- a/src/compiler.ts
+++ b/src/compiler.ts
@@ -838,6 +838,7 @@ export class Compiler extends DiagnosticEmitter {
 
       // just traverse members below
       case ElementKind.ENUM:
+      case ElementKind.INTERFACE_PROTOTYPE:
       case ElementKind.NAMESPACE:
       case ElementKind.TYPEDEFINITION:
       case ElementKind.INDEXSIGNATURE: break;
@@ -907,6 +908,7 @@ export class Compiler extends DiagnosticEmitter {
         if (propertyInstance) this.compileProperty(propertyInstance);
         break;
       }
+      case ElementKind.INTERFACE_PROTOTYPE:
       case ElementKind.NAMESPACE:
       case ElementKind.TYPEDEFINITION:
       case ElementKind.ENUMVALUE:
diff --git a/tests/compiler/exports.ts b/tests/compiler/exports.ts
index c18fc6a1fa..c79d484347 100644
--- a/tests/compiler/exports.ts
+++ b/tests/compiler/exports.ts
@@ -58,3 +58,9 @@ export namespace outer {
 }
 
 export {renamed_mul} from "./export"; 
+
+// interfaces (should not error)
+export interface Iface {}
+export namespace outer {
+  export interface Iface {}
+}