diff --git a/src/transformer/descriptor/helper/helper.ts b/src/transformer/descriptor/helper/helper.ts
index 68e77177d..a1f897a05 100644
--- a/src/transformer/descriptor/helper/helper.ts
+++ b/src/transformer/descriptor/helper/helper.ts
@@ -155,7 +155,8 @@ export namespace TypescriptHelper {
       declarations.find(
         (declaration: ts.Declaration) =>
           !ts.isVariableDeclaration(declaration) &&
-          !ts.isFunctionDeclaration(declaration)
+          !ts.isFunctionDeclaration(declaration) &&
+          !ts.isModuleDeclaration(declaration)
       ) || declarations[0]
     );
   }
diff --git a/test/transformer/descriptor/declarations/declarations.test.ts b/test/transformer/descriptor/declarations/declarations.test.ts
index 947b8cee5..042d8587d 100644
--- a/test/transformer/descriptor/declarations/declarations.test.ts
+++ b/test/transformer/descriptor/declarations/declarations.test.ts
@@ -127,6 +127,23 @@ describe('declarations', () => {
       });
     });
 
+    describe('interface and namespace', () => {
+      // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+      // @ts-ignore
+      namespace InterfaceNamespaceTest {}
+
+      interface InterfaceNamespaceTest {
+        value: boolean;
+        value2: string;
+      }
+
+      it('should ignore the namespace', () => {
+        const properties: InterfaceNamespaceTest = createMock<InterfaceNamespaceTest>();
+        expect(properties.value).toBe(false);
+        expect(properties.value2).toBe('');
+      });
+    });
+
     describe('type', () => {
       // eslint-disable-next-line @typescript-eslint/ban-ts-comment
       // @ts-ignore