diff --git a/src/if_sniff.h b/src/if_sniff.h
index 16cce41..50186b8 100644
--- a/src/if_sniff.h
+++ b/src/if_sniff.h
@@ -9,8 +9,8 @@
 extern int  sniff_request_waiting;
 extern int  sniff_connected;
 extern int  fd_from_sniff;
-extern void sniff_disconnect __ARGS((int immediately));
-extern void ProcessSniffRequests __ARGS((void));
-extern void ex_sniff __ARGS((exarg_T *eap));
+extern void sniff_disconnect(int immediately);
+extern void ProcessSniffRequests(void);
+extern void ex_sniff(exarg_T *eap);
 
 #endif