diff --git a/core/sys/windows/ws2_32.odin b/core/sys/windows/ws2_32.odin
index 66054dd98..ed2ad5e24 100644
--- a/core/sys/windows/ws2_32.odin
+++ b/core/sys/windows/ws2_32.odin
@@ -42,11 +42,13 @@ WSAID_GETACCEPTEXSOCKADDRS :: GUID{0xb5367df2, 0xcbac, 0x11cf, {0x95, 0xca, 0x00
 WSAID_CONNECTX             :: GUID{0x25a207b9, 0xddf3, 0x4660, {0x8e, 0xe9, 0x76, 0xe5, 0x8c, 0x74, 0x06, 0x3e}}
 
 SIO_GET_EXTENSION_FUNCTION_POINTER :: IOC_INOUT | IOC_WS2 | 6
+SIO_UDP_CONNRESET                  :: IOC_IN | IOC_VENDOR | 12
 
-IOC_OUT   :: 0x40000000
-IOC_IN    :: 0x80000000
-IOC_INOUT :: (IOC_IN | IOC_OUT)
-IOC_WS2   :: 0x08000000
+IOC_OUT    :: 0x40000000
+IOC_IN     :: 0x80000000
+IOC_INOUT  :: (IOC_IN | IOC_OUT)
+IOC_WS2    :: 0x08000000
+IOC_VENDOR :: 0x18000000
 
 SO_UPDATE_ACCEPT_CONTEXT :: 28683