diff --git a/sys/kern/tty_pty.c b/sys/kern/tty_pty.c
index 9c1911b..163dfc3 100644
--- a/sys/kern/tty_pty.c
+++ b/sys/kern/tty_pty.c
@@ -302,8 +302,12 @@ pti_done(struct pt_ioctl *pti)
 		 * Interlock open attempts against termination by setting
 		 * PF_TERMINATED.  This allows us to block while cleaning
 		 * out the device infrastructure.
+		 *
+		 * Do not terminate the tty if it still has a session
+		 * association.
 		 */
-		if ((pti->pt_flags2 & (PF_SOPEN|PF_MOPEN)) == 0) {
+		if ((pti->pt_flags2 & (PF_SOPEN|PF_MOPEN)) == 0 &&
+		    pti->pt_tty.t_session == NULL) {
 			pti->pt_flags2 |= PF_TERMINATED;
 			uminor_no = pti->pt_uminor;