Spell _WIN32 correctly.

[skip ci]

1 files changed, 1 insertions, 1 deletions

diff --git a/pcap.c b/pcap.c
index 9e29c493..c3df7104 100644
--- a/pcap.c
+++ b/pcap.c
@@ -129,7 +129,7 @@ struct rtentry;		/* declarations in <net/if.h> */
 #include "pcap-airpcap.h"
 #endif
 
-#ifdef _WI32
+#ifdef _WIN32
 LPCSTR
 PacketGetLPCSTR(void)
 {