diff --git a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_ioctl.c b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_ioctl.c
index 5a4cd90ea73..b1aea455321 100644
--- a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_ioctl.c
+++ b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_ioctl.c
@@ -198,6 +198,7 @@
 #include <sys/vdev_removal.h>
 #include <sys/vdev_impl.h>
 #include <sys/vdev_initialize.h>
+#include <sys/sysent.h>
 
 #include "zfs_namecheck.h"
 #include "zfs_prop.h"
@@ -6662,6 +6663,14 @@ zfsdev_ioctl(struct cdev *dev, u_long zcmd, caddr_t arg, int flag,
 #ifdef illumos
 	minor_t minor = getminor(dev);
 #else
+#ifdef COMPAT_FREEBSD32
+	typedef struct zfs_iocparm32 {
+		uint32_t        zfs_ioctl_version;
+		uint64_t        zfs_cmd;
+		uint64_t        zfs_cmd_size;
+        } __packed zfs_iocparm32_t;
+	zfs_iocparm_t zc_iocparm64;
+#endif
 	zfs_iocparm_t *zc_iocparm;
 	int cflag, cmd, oldvecnum;
 	boolean_t newioc, compat;
@@ -6683,6 +6692,18 @@ zfsdev_ioctl(struct cdev *dev, u_long zcmd, caddr_t arg, int flag,
 	 * Check if we are talking to supported older binaries
 	 * and translate zfs_cmd if necessary
 	 */
+#ifdef COMPAT_FREEBSD32
+	if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
+		if (len == sizeof(zfs_iocparm32_t)) {
+			zfs_iocparm32_t *zc_iocparm32 = (zfs_iocparm32_t*)arg;
+			zc_iocparm64.zfs_ioctl_version = zc_iocparm32->zfs_ioctl_version;
+			zc_iocparm64.zfs_cmd = zc_iocparm32->zfs_cmd;
+			zc_iocparm64.zfs_cmd_size = zc_iocparm32->zfs_cmd_size;
+			arg = (caddr_t)&zc_iocparm64;
+			len = sizeof(zc_iocparm64);
+		}
+	}
+#endif
 	if (len != sizeof(zfs_iocparm_t)) {
 		newioc = B_FALSE;
 		compat = B_TRUE;