diff --git a/sys/compat/freebsd32/freebsd32_misc.c b/sys/compat/freebsd32/freebsd32_misc.c
index 08ef67e7d7b8..8f1494dd3f63 100644
--- a/sys/compat/freebsd32/freebsd32_misc.c
+++ b/sys/compat/freebsd32/freebsd32_misc.c
@@ -1500,11 +1500,9 @@ freebsd32_lseek(struct thread *td, struct freebsd32_lseek_args *uap)
 int
 freebsd32_truncate(struct thread *td, struct freebsd32_truncate_args *uap)
 {
-	struct truncate_args ap;
 
-	ap.path = uap->path;
-	ap.length = PAIR32TO64(off_t,uap->length);
-	return (sys_truncate(td, &ap));
+	return (kern_truncate(td, uap->path, UIO_USERSPACE,
+	    PAIR32TO64(off_t, uap->length)));
 }
 
 int
@@ -1600,11 +1598,9 @@ freebsd6_freebsd32_lseek(struct thread *td, struct freebsd6_freebsd32_lseek_args
 int
 freebsd6_freebsd32_truncate(struct thread *td, struct freebsd6_freebsd32_truncate_args *uap)
 {
-	struct truncate_args ap;
 
-	ap.path = uap->path;
-	ap.length = PAIR32TO64(off_t,uap->length);
-	return (sys_truncate(td, &ap));
+	return (kern_truncate(td, uap->path, UIO_USERSPACE,
+	    PAIR32TO64(off_t, uap->length)));
 }
 
 int
diff --git a/sys/kern/vfs_syscalls.c b/sys/kern/vfs_syscalls.c
index 7420203e4b60..67baefc3d06f 100644
--- a/sys/kern/vfs_syscalls.c
+++ b/sys/kern/vfs_syscalls.c
@@ -3310,22 +3310,10 @@ struct otruncate_args {
 };
 #endif
 int
-otruncate(td, uap)
-	struct thread *td;
-	register struct otruncate_args /* {
-		char *path;
-		long length;
-	} */ *uap;
+otruncate(struct thread *td, struct otruncate_args *uap)
 {
-	struct truncate_args /* {
-		char *path;
-		int pad;
-		off_t length;
-	} */ nuap;
 
-	nuap.path = uap->path;
-	nuap.length = uap->length;
-	return (sys_truncate(td, &nuap));
+	return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length));
 }
 #endif /* COMPAT_43 */
 
@@ -3334,11 +3322,8 @@ otruncate(td, uap)
 int
 freebsd6_truncate(struct thread *td, struct freebsd6_truncate_args *uap)
 {
-	struct truncate_args ouap;
 
-	ouap.path = uap->path;
-	ouap.length = uap->length;
-	return (sys_truncate(td, &ouap));
+	return (kern_truncate(td, uap->path, UIO_USERSPACE, uap->length));
 }
 
 int