diff --git a/types/nodegit/nodegit-tests.ts b/types/nodegit/nodegit-tests.ts
index 2b8eb1451c..c3df3092d9 100644
--- a/types/nodegit/nodegit-tests.ts
+++ b/types/nodegit/nodegit-tests.ts
@@ -69,3 +69,4 @@ signature.email();
 signature.when();
 
 repo.createBlobFromBuffer(Buffer.from("test")).then((oid: Git.Oid) => oid.cpy());
+repo.commondir();
diff --git a/types/nodegit/repository.d.ts b/types/nodegit/repository.d.ts
index d74b39834d..7573809cac 100644
--- a/types/nodegit/repository.d.ts
+++ b/types/nodegit/repository.d.ts
@@ -47,6 +47,7 @@ export class Repository {
     static wrapOdb(odb: Odb): Promise<Repository>;
 
     cleanup(): void;
+    commondir(): string;
     config(): Promise<Config>;
     configSnapshot(): Promise<Config>;
     detachHead(): number;