diff --git a/ruma-client-api/src/r0/account/request_3pid_management_token_via_email.rs b/ruma-client-api/src/r0/account/request_3pid_management_token_via_email.rs
index c9b48a93..ce713a02 100644
--- a/ruma-client-api/src/r0/account/request_3pid_management_token_via_email.rs
+++ b/ruma-client-api/src/r0/account/request_3pid_management_token_via_email.rs
@@ -41,6 +41,10 @@ ruma_api! {
 
         /// URL to submit validation token to. If omitted, verification happens without client.
         #[serde(skip_serializing_if = "Option::is_none")]
+        #[cfg_attr(
+            feature = "compat",
+            serde(default, deserialize_with = "ruma_serde::empty_string_as_none")
+        )]
         pub submit_url: Option<String>
     }
 
diff --git a/ruma-client-api/src/r0/account/request_3pid_management_token_via_msisdn.rs b/ruma-client-api/src/r0/account/request_3pid_management_token_via_msisdn.rs
index 723f1cd3..73885efd 100644
--- a/ruma-client-api/src/r0/account/request_3pid_management_token_via_msisdn.rs
+++ b/ruma-client-api/src/r0/account/request_3pid_management_token_via_msisdn.rs
@@ -44,6 +44,10 @@ ruma_api! {
 
         /// URL to submit validation token to. If omitted, verification happens without client.
         #[serde(skip_serializing_if = "Option::is_none")]
+        #[cfg_attr(
+            feature = "compat",
+            serde(default, deserialize_with = "ruma_serde::empty_string_as_none")
+        )]
         pub submit_url: Option<String>
     }
 
diff --git a/ruma-client-api/src/r0/account/request_password_change_token_via_email.rs b/ruma-client-api/src/r0/account/request_password_change_token_via_email.rs
index c8ac3a27..42cfa1ec 100644
--- a/ruma-client-api/src/r0/account/request_password_change_token_via_email.rs
+++ b/ruma-client-api/src/r0/account/request_password_change_token_via_email.rs
@@ -41,6 +41,10 @@ ruma_api! {
 
         /// URL to submit validation token to. If omitted, verification happens without client.
         #[serde(skip_serializing_if = "Option::is_none")]
+        #[cfg_attr(
+            feature = "compat",
+            serde(default, deserialize_with = "ruma_serde::empty_string_as_none")
+        )]
         pub submit_url: Option<String>
     }
 
diff --git a/ruma-client-api/src/r0/account/request_password_change_token_via_msisdn.rs b/ruma-client-api/src/r0/account/request_password_change_token_via_msisdn.rs
index 82d900d5..1f917354 100644
--- a/ruma-client-api/src/r0/account/request_password_change_token_via_msisdn.rs
+++ b/ruma-client-api/src/r0/account/request_password_change_token_via_msisdn.rs
@@ -37,6 +37,10 @@ ruma_api! {
 
         /// URL to submit validation token to. If omitted, verification happens without client.
         #[serde(skip_serializing_if = "Option::is_none")]
+        #[cfg_attr(
+            feature = "compat",
+            serde(default, deserialize_with = "ruma_serde::empty_string_as_none")
+        )]
         pub submit_url: Option<String>
     }
 
diff --git a/ruma-client-api/src/r0/account/request_registration_token_via_email.rs b/ruma-client-api/src/r0/account/request_registration_token_via_email.rs
index aa8a7138..9a9833bb 100644
--- a/ruma-client-api/src/r0/account/request_registration_token_via_email.rs
+++ b/ruma-client-api/src/r0/account/request_registration_token_via_email.rs
@@ -41,6 +41,10 @@ ruma_api! {
 
         /// URL to submit validation token to. If omitted, verification happens without client.
         #[serde(skip_serializing_if = "Option::is_none")]
+        #[cfg_attr(
+            feature = "compat",
+            serde(default, deserialize_with = "ruma_serde::empty_string_as_none")
+        )]
         pub submit_url: Option<String>
     }
 
diff --git a/ruma-client-api/src/r0/account/request_registration_token_via_msisdn.rs b/ruma-client-api/src/r0/account/request_registration_token_via_msisdn.rs
index 8fe53690..52c482b3 100644
--- a/ruma-client-api/src/r0/account/request_registration_token_via_msisdn.rs
+++ b/ruma-client-api/src/r0/account/request_registration_token_via_msisdn.rs
@@ -44,6 +44,10 @@ ruma_api! {
 
         /// URL to submit validation token to. If omitted, verification happens without client.
         #[serde(skip_serializing_if = "Option::is_none")]
+        #[cfg_attr(
+            feature = "compat",
+            serde(default, deserialize_with = "ruma_serde::empty_string_as_none")
+        )]
         pub submit_url: Option<String>
     }