diff --git a/packages/dids/src/resolver/did-resolver.ts b/packages/dids/src/resolver/did-resolver.ts
index 1c59cf182..8067a9bc2 100644
--- a/packages/dids/src/resolver/did-resolver.ts
+++ b/packages/dids/src/resolver/did-resolver.ts
@@ -83,7 +83,7 @@ export class DidResolver {
   /**
    * A cache for storing resolved DID documents.
    */
-  private cache: DidResolverCache;
+  protected cache: DidResolverCache;
 
   /**
    * A map to store method resolvers against method names.