diff --git a/packages/babel-runtime/scripts/build-dist.js b/packages/babel-runtime/scripts/build-dist.js
index 4f9a3c5a1f..f581bdb4a3 100644
--- a/packages/babel-runtime/scripts/build-dist.js
+++ b/packages/babel-runtime/scripts/build-dist.js
@@ -104,7 +104,7 @@ function buildRuntimeRewritePlugin(relativePath, helperName) {
 }
 
 function buildHelper(helperName, modules, useBuiltIns) {
-  const tree = t.program(helpers.get(helperName).nodes);
+  const tree = t.program(helpers.get(helperName).nodes, [], "module");
 
   const transformOpts = makeTransformOpts(modules, useBuiltIns);
 
diff --git a/packages/babel-types/src/definitions/core.js b/packages/babel-types/src/definitions/core.js
index abdcd57bb1..9bb1181762 100644
--- a/packages/babel-types/src/definitions/core.js
+++ b/packages/babel-types/src/definitions/core.js
@@ -513,13 +513,14 @@ defineType("NewExpression", { inherits: "CallExpression" });
 
 defineType("Program", {
   visitor: ["directives", "body"],
-  builder: ["body", "directives"],
+  builder: ["body", "directives", "sourceType"],
   fields: {
     sourceFile: {
       validate: assertValueType("string"),
     },
     sourceType: {
       validate: assertOneOf("script", "module"),
+      default: "script",
     },
     directives: {
       validate: chain(