diff --git a/tools/syn2mas/src/types/SynapseConfig.d.ts b/tools/syn2mas/src/types/SynapseConfig.d.ts
index 49de636df..d3dfd8332 100644
--- a/tools/syn2mas/src/types/SynapseConfig.d.ts
+++ b/tools/syn2mas/src/types/SynapseConfig.d.ts
@@ -49,4 +49,5 @@ export interface SynapseConfig {
   enable_registration_captcha?: boolean;
   enable_registration?: boolean;
   user_consent?: {};
+  enable_3pid_changes?: boolean;
 }