diff --git a/include/serial.h b/include/serial.h
index 44a257f..6ddc17f 100644
--- a/include/serial.h
+++ b/include/serial.h
@@ -268,6 +268,7 @@ namespace serial {
 			auto endTime = std::chrono::system_clock::now() +
 				std::chrono::milliseconds(timeout);
 			ser.flushReceiver();
+			std::string resp;
 			std::string reallyCommand = std::string(command) + endChar;
 			ser.writeString(reallyCommand.c_str());
 			Log("Send : " + reallyCommand);
@@ -278,8 +279,10 @@ namespace serial {
 				auto size = ser.readBytes(buffer.get(), availableSize, timeout);
 				buffer[size] = '\0';
 				auto str = std::string(buffer.get());
-				if (size > 0)
+				if (size > 0){
 					Log("Receive: " + str);
+					resp += str;
+				}
 				if (((str.find(expect) != std::string::npos) && ...)) {
 					return true;
 				}
@@ -307,7 +310,7 @@ namespace serial {
 				resp += str;
 				if (size > 0)
 					Log("Receive: " + str);
-				if (((str.find(expect) != std::string::npos) && ...)) {
+				if (((resp.find(expect) != std::string::npos) && ...)) {
 					return resp;
 				}
 			}