diff --git a/packages/core/src/modules/dids/domain/DidDocument.ts b/packages/core/src/modules/dids/domain/DidDocument.ts
index 2080d7dfb4..08963613af 100644
--- a/packages/core/src/modules/dids/domain/DidDocument.ts
+++ b/packages/core/src/modules/dids/domain/DidDocument.ts
@@ -26,7 +26,7 @@ interface DidDocumentOptions {
   context?: string | string[]
   id: string
   alsoKnownAs?: string[]
-  controller?: string[]
+  controller?: string | string[]
   verificationMethod?: VerificationMethod[]
   service?: DidDocumentService[]
   authentication?: Array<string | VerificationMethod>