diff --git a/src/stream_interface.c b/src/stream_interface.c
index 1f8295952..cf3f9d2ef 100644
--- a/src/stream_interface.c
+++ b/src/stream_interface.c
@@ -625,7 +625,7 @@ int si_cs_send(struct conn_stream *cs)
 		}
 
 		if (conn->flags & CO_FL_ERROR || cs->flags & CS_FL_ERROR)
-			return 0;
+			return 1;
 	}
 
 	/* At this point, the pipe is empty, but we may still have data pending