diff --git a/server/src/hardware/protocol/z21/messages.cpp b/server/src/hardware/protocol/z21/messages.cpp
index 2df19aa9..199c6b01 100644
--- a/server/src/hardware/protocol/z21/messages.cpp
+++ b/server/src/hardware/protocol/z21/messages.cpp
@@ -301,7 +301,14 @@ void LanX::updateChecksum(uint8_t len)
 {
   uint8_t val = XpressNet::calcChecksum(*reinterpret_cast<const XpressNet::Message*>(&xheader), len);
   uint8_t* checksum = &xheader + len + 1;
+#ifdef __MINGW32__
+  #pragma GCC diagnostic push
+  #pragma GCC diagnostic ignored "-Wstringop-overflow"
+#endif
   *checksum = val;
+#ifdef __MINGW32__
+  #pragma GCC diagnostic pop  
+#endif
 }
 
 bool LanX::isChecksumValid(const LanX &lanX)