diff --git a/libknet/tests/test-common.c b/libknet/tests/test-common.c
index 481d7fe03..b3cf9638a 100644
--- a/libknet/tests/test-common.c
+++ b/libknet/tests/test-common.c
@@ -581,5 +581,6 @@ int wait_for_packet(knet_handle_t knet_h, int seconds, int datafd, int logfd, FI
 		return 0;
 	}
 
+	errno = ETIMEDOUT;
 	return -1;
 }