diff --git a/sdk/include/psdk/ipexport.h b/sdk/include/psdk/ipexport.h
index 906bbb0edf6..608952eec8f 100644
--- a/sdk/include/psdk/ipexport.h
+++ b/sdk/include/psdk/ipexport.h
@@ -66,7 +66,7 @@ typedef struct ip_option_information IP_OPTION_INFORMATION, *PIP_OPTION_INFORMAT
 
 typedef struct icmp_echo_reply ICMP_ECHO_REPLY, *PICMP_ECHO_REPLY;
 
-#if _WIN64
+#ifdef _WIN64
 struct icmp_echo_reply32
 {
     IPAddr                       Address;