diff --git a/src/finalisers/shared/getExportBlock.ts b/src/finalisers/shared/getExportBlock.ts
index 4c2f613f4c4..c1036e1ee58 100644
--- a/src/finalisers/shared/getExportBlock.ts
+++ b/src/finalisers/shared/getExportBlock.ts
@@ -62,8 +62,15 @@ export default function getExportBlock(
 							reexports.some(
 								specifier => specifier.imported !== 'default' && specifier.imported !== '*'
 							));
+
+					const reexportsDefaultAsDefault =
+						reexports &&
+						reexports.some(
+							specifier => specifier.imported === 'default' && specifier.reexported === 'default'
+						);
+
 					if (exportBlock && !compact) exportBlock += '\n';
-					if (exportsNamesOrNamespace)
+					if (exportsNamesOrNamespace || reexportsDefaultAsDefault)
 						exportBlock += `exports.${specifier.reexported}${_}=${_}${name}${
 							interop !== false ? '__default' : '.default'
 						};`;
diff --git a/test/form/samples/re-export-default-external-as-default/_config.js b/test/form/samples/re-export-default-external-as-default/_config.js
new file mode 100644
index 00000000000..d7ee1a9e9d9
--- /dev/null
+++ b/test/form/samples/re-export-default-external-as-default/_config.js
@@ -0,0 +1,7 @@
+module.exports = {
+	description: 're-exports a default external import as default export (when using named exports)',
+	options: {
+		output: { name: 'reexportsDefaultExternalAsDefault', exports: 'named' },
+		external: ['external']
+	}
+};
diff --git a/test/form/samples/re-export-default-external-as-default/_expected/amd.js b/test/form/samples/re-export-default-external-as-default/_expected/amd.js
new file mode 100644
index 00000000000..8bc157376f8
--- /dev/null
+++ b/test/form/samples/re-export-default-external-as-default/_expected/amd.js
@@ -0,0 +1,12 @@
+define(['exports', 'external'], function (exports, external) { 'use strict';
+
+	var external__default = 'default' in external ? external['default'] : external;
+
+
+
+	Object.keys(external).forEach(function (key) { exports[key] = external[key]; });
+	exports.default = external__default;
+
+	Object.defineProperty(exports, '__esModule', { value: true });
+
+});
diff --git a/test/form/samples/re-export-default-external-as-default/_expected/cjs.js b/test/form/samples/re-export-default-external-as-default/_expected/cjs.js
new file mode 100644
index 00000000000..1ecf08ad403
--- /dev/null
+++ b/test/form/samples/re-export-default-external-as-default/_expected/cjs.js
@@ -0,0 +1,13 @@
+'use strict';
+
+Object.defineProperty(exports, '__esModule', { value: true });
+
+function _interopDefault (ex) { return (ex && (typeof ex === 'object') && 'default' in ex) ? ex['default'] : ex; }
+
+var external = require('external');
+var external__default = _interopDefault(external);
+
+
+
+Object.keys(external).forEach(function (key) { exports[key] = external[key]; });
+exports.default = external__default;
diff --git a/test/form/samples/re-export-default-external-as-default/_expected/es.js b/test/form/samples/re-export-default-external-as-default/_expected/es.js
new file mode 100644
index 00000000000..508209b527e
--- /dev/null
+++ b/test/form/samples/re-export-default-external-as-default/_expected/es.js
@@ -0,0 +1,2 @@
+export * from 'external';
+export { default } from 'external';
diff --git a/test/form/samples/re-export-default-external-as-default/_expected/iife.js b/test/form/samples/re-export-default-external-as-default/_expected/iife.js
new file mode 100644
index 00000000000..13e44bba082
--- /dev/null
+++ b/test/form/samples/re-export-default-external-as-default/_expected/iife.js
@@ -0,0 +1,13 @@
+var reexportsDefaultExternalAsDefault = (function (exports, external) {
+	'use strict';
+
+	var external__default = 'default' in external ? external['default'] : external;
+
+
+
+	Object.keys(external).forEach(function (key) { exports[key] = external[key]; });
+	exports.default = external__default;
+
+	return exports;
+
+}({}, external));
diff --git a/test/form/samples/re-export-default-external-as-default/_expected/system.js b/test/form/samples/re-export-default-external-as-default/_expected/system.js
new file mode 100644
index 00000000000..ea3d45de194
--- /dev/null
+++ b/test/form/samples/re-export-default-external-as-default/_expected/system.js
@@ -0,0 +1,19 @@
+System.register('reexportsDefaultExternalAsDefault', ['external'], function (exports, module) {
+	'use strict';
+	var _starExcludes = { default: 1 };
+	return {
+		setters: [function (module) {
+			var _setter = {};
+			for (var _$p in module) {
+				if (!_starExcludes[_$p]) _setter[_$p] = module[_$p];
+			}
+			_setter.default = module.default;
+			exports(_setter);
+		}],
+		execute: function () {
+
+
+
+		}
+	};
+});
diff --git a/test/form/samples/re-export-default-external-as-default/_expected/umd.js b/test/form/samples/re-export-default-external-as-default/_expected/umd.js
new file mode 100644
index 00000000000..86629fd6123
--- /dev/null
+++ b/test/form/samples/re-export-default-external-as-default/_expected/umd.js
@@ -0,0 +1,16 @@
+(function (global, factory) {
+	typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports, require('external')) :
+	typeof define === 'function' && define.amd ? define(['exports', 'external'], factory) :
+	(global = global || self, factory(global.reexportsDefaultExternalAsDefault = {}, global.external));
+}(this, function (exports, external) { 'use strict';
+
+	var external__default = 'default' in external ? external['default'] : external;
+
+
+
+	Object.keys(external).forEach(function (key) { exports[key] = external[key]; });
+	exports.default = external__default;
+
+	Object.defineProperty(exports, '__esModule', { value: true });
+
+}));
diff --git a/test/form/samples/re-export-default-external-as-default/main.js b/test/form/samples/re-export-default-external-as-default/main.js
new file mode 100644
index 00000000000..508209b527e
--- /dev/null
+++ b/test/form/samples/re-export-default-external-as-default/main.js
@@ -0,0 +1,2 @@
+export * from 'external';
+export { default } from 'external';