diff --git a/modules/bp/backend.py b/modules/bp/backend.py
index 9ed7af74..4c9314f2 100644
--- a/modules/bp/backend.py
+++ b/modules/bp/backend.py
@@ -49,7 +49,7 @@ class BPBackend(BaseBackend, ICapBank):
         return self.browser.get_account(_id)
 
     def iter_history(self, account):
-        if account.type != Account.TYPE_MARKET:
+        if account.type == Account.TYPE_MARKET:
             raise NotImplementedError()
         for tr in self.browser.get_history(account):
             if not tr._coming: