diff --git a/lib/core/libwebsockets.c b/lib/core/libwebsockets.c
index 1d9c4bdcbef00fc323d6f25b41ad0f3d16ef56c6..2bcd015e3b1db1717235349599aca9292e15fdd8 100644
--- a/lib/core/libwebsockets.c
+++ b/lib/core/libwebsockets.c
@@ -28,7 +28,7 @@
 #ifdef LWS_WITH_IPV6
 #if defined(WIN32) || defined(_WIN32)
 #include <wincrypt.h>
-#include <Iphlpapi.h>
+#include <iphlpapi.h>
 #else
 #include <net/if.h>
 #endif