diff --git a/C/irc.h b/C/irc.h
index 9041e7e..6f4ed67 100644
--- a/C/irc.h
+++ b/C/irc.h
@@ -8,8 +8,9 @@
 	 motd parsing
 */
 
-#ifdef IRC_LINUX
-#define IRC_LINUX
+#if defined(_WIN32) || defined(_WIN64)
+	#error "Only unix"
+#endif
 
 #include <stdio.h>
 #include <string.h>
@@ -52,4 +53,3 @@ unsigned int IRCC_recv(IRCC_client *irc);
 void IRCC_send(IRCC_client *irc, char *msg, char *channel);
 unsigned int IRCC_init(IRCC_client *irc, size_t size);
 void IRCC_close(IRCC_client *irc);
-#endif