diff --git a/packages/@aws-cdk/aws-docdb/lib/instance.ts b/packages/@aws-cdk/aws-docdb/lib/instance.ts
index 1a791b99a0bf5..9611235077389 100644
--- a/packages/@aws-cdk/aws-docdb/lib/instance.ts
+++ b/packages/@aws-cdk/aws-docdb/lib/instance.ts
@@ -101,7 +101,7 @@ abstract class DatabaseInstanceBase extends cdk.Resource implements IDatabaseIns
    */
   public get instanceArn(): string {
     return cdk.Stack.of(this).formatArn({
-      service: 'docdb',
+      service: 'rds',
       resource: 'db',
       arnFormat: ArnFormat.COLON_RESOURCE_NAME,
       resourceName: this.instanceIdentifier,
diff --git a/packages/@aws-cdk/aws-docdb/test/instance.test.ts b/packages/@aws-cdk/aws-docdb/test/instance.test.ts
index d7e90af3e3e90..a83525110f8f8 100644
--- a/packages/@aws-cdk/aws-docdb/test/instance.test.ts
+++ b/packages/@aws-cdk/aws-docdb/test/instance.test.ts
@@ -117,7 +117,7 @@ describe('DatabaseInstance', () => {
           [
             'arn:',
             { Ref: 'AWS::Partition' },
-            ':docdb:us-test-1:12345:db:',
+            ':rds:us-test-1:12345:db:',
             { Ref: 'InstanceC1063A87' },
           ],
         ],
@@ -160,7 +160,7 @@ describe('DatabaseInstance', () => {
           [
             'arn:',
             { Ref: 'AWS::Partition' },
-            `:docdb:us-test-1:12345:db:${instanceIdentifier}`,
+            `:rds:us-test-1:12345:db:${instanceIdentifier}`,
           ],
         ],
       },