diff --git a/proc.c b/proc.c
index 04ef8fb..1fe4890 100644
--- a/proc.c
+++ b/proc.c
@@ -87,9 +87,7 @@
 };
 
 int
-proc_ioctl(tcp, code, arg)
-struct tcb *tcp;
-int code, arg;
+proc_ioctl(struct tcb *tcp, int code, int arg)
 {
 	int val;
 	prstatus_t status;
@@ -203,9 +201,7 @@
 };
 
 int
-proc_ioctl(tcp, code, arg)
-struct tcb *tcp;
-int code, arg;
+proc_ioctl(struct tcb *tcp, int code, int arg)
 {
 	int val;
 	struct procfs_status status;