diff --git a/src/ast/nodes/ExportDefaultDeclaration.js b/src/ast/nodes/ExportDefaultDeclaration.js
index 716ffcf..ab4a776 100644
--- a/src/ast/nodes/ExportDefaultDeclaration.js
+++ b/src/ast/nodes/ExportDefaultDeclaration.js
@@ -49,7 +49,7 @@ export default class ExportDefaultDeclaration extends Node {
 		const treeshake = this.module.bundle.treeshake;
 		const name = this.getName( es );
 
-		if ( this.shouldInclude ) {
+		if ( this.shouldInclude || this.declaration.activated ) {
 			if ( this.activated ) {
 				if ( functionOrClassDeclaration.test( this.declaration.type ) ) {
 					if ( this.declaration.id ) {
@@ -76,7 +76,7 @@ export default class ExportDefaultDeclaration extends Node {
 			super.render( code, es );
 		} else {
 			if ( treeshake ) {
-				if ( functionOrClassDeclaration.test( this.declaration.type ) && !this.declaration.activated ) {
+				if ( functionOrClassDeclaration.test( this.declaration.type ) ) {
 					code.remove( this.leadingCommentStart || this.start, this.next || this.end );
 				} else {
 					const hasEffects = this.declaration.hasEffects( this.module.scope );
diff --git a/test/function/includes-internally-used-default-export/_config.js b/test/function/includes-internally-used-default-export/_config.js
new file mode 100644
index 0000000..3eab340
--- /dev/null
+++ b/test/function/includes-internally-used-default-export/_config.js
@@ -0,0 +1,3 @@
+module.exports = {
+	description: 'includes default exports that are only used internally'
+};
diff --git a/test/function/includes-internally-used-default-export/main.js b/test/function/includes-internally-used-default-export/main.js
new file mode 100644
index 0000000..c196b10
--- /dev/null
+++ b/test/function/includes-internally-used-default-export/main.js
@@ -0,0 +1,3 @@
+import { b } from './module.js';
+
+assert.equal(b(), 15);
diff --git a/test/function/includes-internally-used-default-export/module.js b/test/function/includes-internally-used-default-export/module.js
new file mode 100644
index 0000000..ba2c4ee
--- /dev/null
+++ b/test/function/includes-internally-used-default-export/module.js
@@ -0,0 +1,7 @@
+export default function a() {
+	return 5;
+}
+
+export function b() {
+	return a() + 10;
+}