diff --git a/ixwebsocket/IXDNSLookup.cpp b/ixwebsocket/IXDNSLookup.cpp
index 938d75e3..9a2874f1 100644
--- a/ixwebsocket/IXDNSLookup.cpp
+++ b/ixwebsocket/IXDNSLookup.cpp
@@ -24,6 +24,12 @@
 #include <string.h>
 #include <thread>
 
+// mingw build quirks
+#if defined(_WIN32) && defined(__GNUC__)
+#define AI_NUMERICSERV NI_NUMERICSERV
+#define AI_ADDRCONFIG LUP_ADDRCONFIG
+#endif
+
 namespace ix
 {
     const int64_t DNSLookup::kDefaultWait = 1; // ms