diff --git a/io/Makefile b/io/Makefile
index edee38e233..435f5a994f 100644
--- a/io/Makefile
+++ b/io/Makefile
@@ -91,8 +91,6 @@ routines := \
   getcwd \
   getdirname \
   getwd \
-  isatty \
-  isatty_nostatus \
   lchmod \
   lchown \
   link \
diff --git a/io/Versions b/io/Versions
index 4e19540885..04d196eee0 100644
--- a/io/Versions
+++ b/io/Versions
@@ -26,9 +26,6 @@ libc {
     # g*
     get_current_dir_name; getcwd; getwd;
 
-    # i*
-    isatty;
-
     # l*
     lchown; link; lockf; lseek;
 
diff --git a/termios/Makefile b/termios/Makefile
index 3cbd8917ad..1e23608255 100644
--- a/termios/Makefile
+++ b/termios/Makefile
@@ -36,6 +36,8 @@ routines := \
   cfmakeraw \
   cfsetbaud \
   cfsetspeed \
+  isatty \
+  isatty_nostatus \
   speed \
   tcdrain \
   tcflow \
diff --git a/termios/Versions b/termios/Versions
index a5eec83257..03e2063b1f 100644
--- a/termios/Versions
+++ b/termios/Versions
@@ -3,6 +3,9 @@ libc {
     # c*
     cfgetispeed; cfgetospeed; cfmakeraw; cfsetispeed; cfsetospeed; cfsetspeed;
 
+    # i*
+    isatty;
+
     # t*
     tcdrain; tcflow; tcflush; tcgetattr; tcgetpgrp; tcsendbreak; tcsetattr;
     tcsetpgrp;
diff --git a/io/isatty.c b/termios/isatty.c
similarity index 100%
rename from io/isatty.c
rename to termios/isatty.c
diff --git a/io/isatty_nostatus.c b/termios/isatty_nostatus.c
similarity index 100%
rename from io/isatty_nostatus.c
rename to termios/isatty_nostatus.c