diff --git a/lib/cssModuleToInterface.js b/lib/cssModuleToInterface.js
index 6292511..79d9a0c 100644
--- a/lib/cssModuleToInterface.js
+++ b/lib/cssModuleToInterface.js
@@ -76,5 +76,5 @@ var generateNamedExports = exports.generateNamedExports = function generateNamed
 var generateGenericExportInterface = exports.generateGenericExportInterface = function generateGenericExportInterface(cssModuleKeys, filename, indent) {
   var interfaceName = filenameToInterfaceName(filename);
   var interfaceProperties = cssModuleToTypescriptInterfaceProperties(cssModuleKeys, indent);
-  return 'export interface ' + interfaceName + ' {\n' + interfaceProperties + '\n}\n\nexport const locals: ' + interfaceName + ';\nexport default locals;\n';
+  return 'export interface ' + interfaceName + ' {\n' + interfaceProperties + '\n}\n\nexport const locals: ' + interfaceName + ' & { [className: string]: string };\nexport default locals;\n';
 };
\ No newline at end of file
diff --git a/src/cssModuleToInterface.js b/src/cssModuleToInterface.js
index 3415402..a484f6c 100644
--- a/src/cssModuleToInterface.js
+++ b/src/cssModuleToInterface.js
@@ -94,7 +94,7 @@ export const generateGenericExportInterface = (cssModuleKeys, filename, indent)
 ${interfaceProperties}
 }
 
-export const locals: ${interfaceName};
+export const locals: ${interfaceName} & { [className: string]: string };
 export default locals;
 `);
 };
diff --git a/test/example-camelcase.css.d.ts b/test/example-camelcase.css.d.ts
index 138b508..a0164ad 100644
--- a/test/example-camelcase.css.d.ts
+++ b/test/example-camelcase.css.d.ts
@@ -4,4 +4,5 @@ export interface IExampleCamelcaseCss {
   'barBaz': string;
 }
 
-export const locals: IExampleCamelcaseCss;
+export const locals: IExampleCamelcaseCss & { [className: string]: string };
+export default locals;