diff --git a/libc/stdio/stdio.cpp b/libc/stdio/stdio.cpp
index 5df1bb9..3aabbe2 100644
--- a/libc/stdio/stdio.cpp
+++ b/libc/stdio/stdio.cpp
@@ -36,6 +36,7 @@
 #include <errno.h>
 #include <fcntl.h>
 #include <limits.h>
+#include <paths.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sys/param.h>
@@ -598,3 +599,7 @@
   }
   return fp;
 }
+
+char* ctermid(char* s) {
+  return s ? strcpy(s, _PATH_TTY) : const_cast<char*>(_PATH_TTY);
+}