diff --git a/main.c b/main.c

index 95bd7cb..5418e97 100644

--- a/main.c

+++ b/main.c

@@ -3731,7 +3731,8 @@ spawnXTerm(XtermWidget xw)

SysError(ERROR_OPPTSNAME);

}

#ifdef I_PUSH

- else if (ioctl(ptyfd, I_PUSH, "ptem") < 0) {

+ else if ((ioctl(ptyfd, I_FIND, "ptem") == 0) &&

+ (ioctl(ptyfd, I_PUSH, "ptem") < 0)) {

SysError(ERROR_PTEM);

}

#if !defined(SVR4) && !(defined(SYSV) && defined(i386))

@@ -3740,11 +3741,13 @@ spawnXTerm(XtermWidget xw)

SysError(ERROR_CONSEM);

}

#endif /* !SVR4 */

- else if (ioctl(ptyfd, I_PUSH, "ldterm") < 0) {

+ else if ((ioctl(ptyfd, I_FIND, "ldterm") == 0) &&

+ (ioctl(ptyfd, I_PUSH, "ldterm") < 0)) {

SysError(ERROR_LDTERM);

}

#ifdef SVR4 /* from Sony */

- else if (ioctl(ptyfd, I_PUSH, "ttcompat") < 0) {

+ else if ((ioctl(ptyfd, I_FIND, "ttcompat") == 0) &&

+ (ioctl(ptyfd, I_PUSH, "ttcompat") < 0)) {

SysError(ERROR_TTCOMPAT);

}

#endif /* SVR4 */