diff --git a/patches/mlibc/jinx-working-patch.patch b/patches/mlibc/jinx-working-patch.patch
index 1f311710..355a8676 100644
--- a/patches/mlibc/jinx-working-patch.patch
+++ b/patches/mlibc/jinx-working-patch.patch
@@ -68,3 +68,20 @@ index 1ed110d..ded9114 100644
 -	}
 +void backtrace_symbols_fd(void *const *, int, int) {
  }
+diff --git mlibc-clean/sysdeps/astral/generic/generic.cpp mlibc-workdir/sysdeps/astral/generic/generic.cpp
+index 939925e..5ee7fad 100644
+--- mlibc-clean/sysdeps/astral/generic/generic.cpp
++++ mlibc-workdir/sysdeps/astral/generic/generic.cpp
+@@ -47,6 +47,12 @@ namespace mlibc {
+ 		return 0;
+ 	}
+ 
++	int sys_unlockpt(int fd) {
++		int r;
++		// unlockpt is a no-op kernel side, so use this to check for an invalid pty
++		return sys_ioctl(fd, 0x13376167, NULL, &r);
++	}
++
+ 	int sys_readv(int fd, const struct iovec *iovs, int iovc, ssize_t *bytes_read) {
+ 		long r;
+ 		int error = syscall(SYSCALL_READV, &r, fd, (uint64_t)iovs, iovc);