diff --git a/lib/form/MemberConfigForm/MemberConfigMobileAddressForm.class.php b/lib/form/MemberConfigForm/MemberConfigMobileAddressForm.class.php
index e15dff3ff..6252cd795 100644
--- a/lib/form/MemberConfigForm/MemberConfigMobileAddressForm.class.php
+++ b/lib/form/MemberConfigForm/MemberConfigMobileAddressForm.class.php
@@ -31,6 +31,11 @@ public function __construct(Member $member = null, $options = array(), $CSRFSecr
 
   public function saveConfig($name, $value)
   {
+    if ($name === 'captcha')
+    {
+      return;
+    }
+
     if ($name === 'mobile_address')
     {
       $this->savePreConfig($name, $value);
diff --git a/lib/form/MemberConfigForm/MemberConfigPcAddressForm.class.php b/lib/form/MemberConfigForm/MemberConfigPcAddressForm.class.php
index 38e1c7c4a..b0642f3ce 100644
--- a/lib/form/MemberConfigForm/MemberConfigPcAddressForm.class.php
+++ b/lib/form/MemberConfigForm/MemberConfigPcAddressForm.class.php
@@ -31,6 +31,11 @@ public function __construct(Member $member = null, $options = array(), $CSRFSecr
 
   public function saveConfig($name, $value)
   {
+    if ($name === 'captcha')
+    {
+      return;
+    }
+
     if ($name === 'pc_address')
     {
       $this->savePreConfig($name, $value);