diff --git a/connectrum/client.py b/connectrum/client.py
index c799592..6da08fd 100644
--- a/connectrum/client.py
+++ b/connectrum/client.py
@@ -61,6 +61,11 @@ def _connection_lost(self, protocol):
         self.protocol = None
         logger.warn("Electrum server connection lost")
 
+        for (_, fut) in self.inflight.values():
+            fut.set_exception(ElectrumErrorResponse("Electrum server connection lost"))
+
+        self.inflight.clear()
+
         # cleanup keep alive task
         if self.ka_task:
             self.ka_task.cancel()