diff --git a/src/ast/scopes/ModuleScope.js b/src/ast/scopes/ModuleScope.js
index 1da09aae483..ec9b1c157b8 100644
--- a/src/ast/scopes/ModuleScope.js
+++ b/src/ast/scopes/ModuleScope.js
@@ -20,8 +20,18 @@ export default class ModuleScope extends Scope {
 		forOwn( this.module.imports, specifier => {
 			if ( specifier.module.isExternal ) return;
 
+			const addDeclaration = declaration => {
+				if ( declaration.isNamespace ) {
+					declaration.module.getExports().forEach( name => {
+						addDeclaration( declaration.module.traceExport(name) );
+					});
+				}
+
+				names.add( declaration.name );
+			};
+
 			specifier.module.getExports().forEach( name => {
-				names.add( specifier.module.traceExport(name).name );
+				addDeclaration( specifier.module.traceExport(name) );
 			});
 
 			if ( specifier.name !== '*' ) {
diff --git a/test/function/samples/deshadowed-namespaced-import/_config.js b/test/function/samples/deshadowed-namespaced-import/_config.js
new file mode 100644
index 00000000000..caf19b703cc
--- /dev/null
+++ b/test/function/samples/deshadowed-namespaced-import/_config.js
@@ -0,0 +1,3 @@
+module.exports = {
+	description: '#1488'
+};
\ No newline at end of file
diff --git a/test/function/samples/deshadowed-namespaced-import/foo.js b/test/function/samples/deshadowed-namespaced-import/foo.js
new file mode 100644
index 00000000000..ab9d11e7d27
--- /dev/null
+++ b/test/function/samples/deshadowed-namespaced-import/foo.js
@@ -0,0 +1,2 @@
+import * as ns from './ns.js';
+export { ns };
\ No newline at end of file
diff --git a/test/function/samples/deshadowed-namespaced-import/main.js b/test/function/samples/deshadowed-namespaced-import/main.js
new file mode 100644
index 00000000000..3178bf05289
--- /dev/null
+++ b/test/function/samples/deshadowed-namespaced-import/main.js
@@ -0,0 +1,10 @@
+import { ns } from './foo.js';
+
+assert.equal((() => {
+	function foo() {
+		return ns.foo();
+	}
+
+	return foo();
+})(), 42);
+
diff --git a/test/function/samples/deshadowed-namespaced-import/ns.js b/test/function/samples/deshadowed-namespaced-import/ns.js
new file mode 100644
index 00000000000..19ae356d4ec
--- /dev/null
+++ b/test/function/samples/deshadowed-namespaced-import/ns.js
@@ -0,0 +1,3 @@
+export function foo() {
+	return 42;
+}
\ No newline at end of file