diff --git a/src/runtime/modules/call.js b/src/runtime/modules/call.js
new file mode 100644
index 000000000..1980ba77c
--- /dev/null
+++ b/src/runtime/modules/call.js
@@ -0,0 +1,15 @@
+// Copyright 2016 Traceur Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+export {tailCall as default} from './properTailCalls.js';
diff --git a/src/runtime/modules/construct.js b/src/runtime/modules/construct.js
new file mode 100644
index 000000000..7db5bb8ba
--- /dev/null
+++ b/src/runtime/modules/construct.js
@@ -0,0 +1,15 @@
+// Copyright 2016 Traceur Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+export {construct as default} from './properTailCalls.js';
diff --git a/src/runtime/modules/continuation.js b/src/runtime/modules/continuation.js
new file mode 100644
index 000000000..31f8ed573
--- /dev/null
+++ b/src/runtime/modules/continuation.js
@@ -0,0 +1,15 @@
+// Copyright 2016 Traceur Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+export {createContinuation as default} from './properTailCalls.js';
diff --git a/src/runtime/modules/initTailRecursiveFunction.js b/src/runtime/modules/initTailRecursiveFunction.js
new file mode 100644
index 000000000..89bbb24db
--- /dev/null
+++ b/src/runtime/modules/initTailRecursiveFunction.js
@@ -0,0 +1,15 @@
+// Copyright 2016 Traceur Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+export {initTailRecursiveFunction as default} from './properTailCalls.js';
diff --git a/src/runtime/modules/properTailCalls.js b/src/runtime/modules/properTailCalls.js
index fd80fae44..56dcc2831 100644
--- a/src/runtime/modules/properTailCalls.js
+++ b/src/runtime/modules/properTailCalls.js
@@ -20,7 +20,7 @@ var CONTINUATION_TYPE = Object.create(null);
 
 var isTailRecursiveName = null;
 
-function createContinuation(operand, thisArg, argsArray) {
+export function createContinuation(operand, thisArg, argsArray) {
   return [CONTINUATION_TYPE, operand, thisArg, argsArray];
 }
 
@@ -47,7 +47,7 @@ function isTailRecursive(func) {
   return !!getPrivate(func, isTailRecursiveName);
 }
 
-function tailCall(func, thisArg, argArray) {
+export function tailCall(func, thisArg, argArray) {
   var continuation = argArray[0];
   if (isContinuation(continuation)) {
     continuation = $apply(func, thisArg, continuation[3]);
@@ -113,6 +113,3 @@ export function initTailRecursiveFunction(func) {
   setPrivate(func, isTailRecursiveName, true);
   return func;
 }
-
-export {tailCall as call};
-export {createContinuation as continuation};
diff --git a/src/runtime/properTailCalls.js b/src/runtime/properTailCalls.js
index cc51ab280..cb0f0b5c0 100644
--- a/src/runtime/properTailCalls.js
+++ b/src/runtime/properTailCalls.js
@@ -12,12 +12,10 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-import {
-  initTailRecursiveFunction,
-  call,
-  continuation,
-  construct,
-} from './modules/properTailCalls.js';
+import initTailRecursiveFunction from './modules/initTailRecursiveFunction.js';
+import call from './modules/call.js';
+import continuation from './modules/continuation.js';
+import construct from './modules/construct.js';
 
 $traceurRuntime.initTailRecursiveFunction = initTailRecursiveFunction;
 $traceurRuntime.call = call;