diff --git a/sys/compat/sunos/sunos_syscallargs.h b/sys/compat/sunos/sunos_syscallargs.h
index cf9f3da584bb..adab05137e9c 100644
--- a/sys/compat/sunos/sunos_syscallargs.h
+++ b/sys/compat/sunos/sunos_syscallargs.h
@@ -97,6 +97,12 @@ struct sunos_sys_setpgrp_args {
 	syscallarg(int) pgid;
 };
 
+struct sunos_sys_fcntl_args {
+	syscallarg(int) fd;
+	syscallarg(int) cmd;
+	syscallarg(void *) arg;
+};
+
 struct sunos_sys_setsockopt_args {
 	syscallarg(int) s;
 	syscallarg(int) level;
@@ -268,7 +274,7 @@ int	compat_43_sys_gethostname	__P((struct proc *, void *, register_t *));
 int	compat_43_sys_sethostname	__P((struct proc *, void *, register_t *));
 int	compat_43_sys_getdtablesize	__P((struct proc *, void *, register_t *));
 int	sys_dup2	__P((struct proc *, void *, register_t *));
-int	sys_fcntl	__P((struct proc *, void *, register_t *));
+int	sunos_sys_fcntl	__P((struct proc *, void *, register_t *));
 int	sys_select	__P((struct proc *, void *, register_t *));
 int	sys_fsync	__P((struct proc *, void *, register_t *));
 int	sys_setpriority	__P((struct proc *, void *, register_t *));
diff --git a/sys/compat/sunos/sunos_sysent.c b/sys/compat/sunos/sunos_sysent.c
index dbd17ba4f5eb..032bea5a5521 100644
--- a/sys/compat/sunos/sunos_sysent.c
+++ b/sys/compat/sunos/sunos_sysent.c
@@ -218,8 +218,8 @@ struct sysent sunos_sysent[] = {
 	    sys_dup2 },				/* 90 = dup2 */
 	{ 0, 0,
 	    sys_nosys },			/* 91 = unimplemented getdopt */
-	{ 3, s(struct sys_fcntl_args),
-	    sys_fcntl },			/* 92 = fcntl */
+	{ 3, s(struct sunos_sys_fcntl_args),
+	    sunos_sys_fcntl },			/* 92 = fcntl */
 	{ 5, s(struct sys_select_args),
 	    sys_select },			/* 93 = select */
 	{ 0, 0,