diff --git a/lib/codegen/index.d.ts b/lib/codegen/index.d.ts
index 47b7b0c71..f8ed9089c 100644
--- a/lib/codegen/index.d.ts
+++ b/lib/codegen/index.d.ts
@@ -24,7 +24,7 @@ declare function codegen(functionParams: string[], functionName?: string): Codeg
  */
 declare function codegen(functionName?: string): Codegen;
 
-namespace codegen {
+declare namespace codegen {
 
     /** When set to `true`, codegen will log generated code to console. Useful for debugging. */
     let verbose: boolean;
diff --git a/lib/codegen/package.json b/lib/codegen/package.json
index 4a905283c..4e82f9562 100644
--- a/lib/codegen/package.json
+++ b/lib/codegen/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@protobufjs/codegen",
   "description": "A minimalistic code generation utility.",
-  "version": "2.0.3",
+  "version": "2.0.4",
   "author": "Daniel Wirtz <dcode+protobufjs@dcode.io>",
   "repository": {
     "type": "git",
diff --git a/package.json b/package.json
index 6ee6dc9d7..6844b87b5 100644
--- a/package.json
+++ b/package.json
@@ -46,7 +46,7 @@
   "dependencies": {
     "@protobufjs/aspromise": "^1.1.2",
     "@protobufjs/base64": "^1.1.2",
-    "@protobufjs/codegen": "^2.0.3",
+    "@protobufjs/codegen": "^2.0.4",
     "@protobufjs/eventemitter": "^1.1.0",
     "@protobufjs/fetch": "^1.1.0",
     "@protobufjs/float": "^1.0.2",