diff --git a/lib/config/validation.spec.ts b/lib/config/validation.spec.ts
index a3e91f3238e9de8c95e1fef6bed4a40e9683d7bb..3c3edfff5971cc35ab8f82fc12747bf4c55fc956 100644
--- a/lib/config/validation.spec.ts
+++ b/lib/config/validation.spec.ts
@@ -291,6 +291,7 @@ describe('config/validation', () => {
             matchStrings: ['ENV (?<currentValue>.*?)\\s'],
             depNameTemplate: 'foo',
             datasourceTemplate: 'bar',
+            registryUrlTemplate: 'foobar',
           },
         ],
       };
diff --git a/lib/config/validation.ts b/lib/config/validation.ts
index b547434a748d435f2003da1c866663edcd14bc7a..84b0d79b01322998e32d53f22fed20fab6ac05fa 100644
--- a/lib/config/validation.ts
+++ b/lib/config/validation.ts
@@ -277,6 +277,7 @@ export async function validateConfig(
                 'lookupNameTemplate',
                 'datasourceTemplate',
                 'versioningTemplate',
+                'registryUrlTemplate',
               ];
               // TODO: fix types
               for (const regexManager of val as any[]) {