diff --git a/src/error.rs b/src/error.rs
index 627b20d..6c07980 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -14,6 +14,8 @@ pub enum TerminalError {
     StdoutError,
     /// Failed to read from stdin.
     StdinError,
+    /// Failed to parse number.
+    ParseError,
 }
 
 impl TerminalError {
@@ -24,6 +26,7 @@ impl TerminalError {
             TerminalError::TermSizeError => "Failed to get terminal size.",
             TerminalError::StdoutError => "Failed to write to stdout.",
             TerminalError::StdinError => "Failed to read from stdin.",
+            TerminalError::ParseError => "Failed to parse number.",
         }
     }
 }
diff --git a/src/lib.rs b/src/lib.rs
index 22044aa..c29790d 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -18,10 +18,7 @@ pub use error::TerminalError;
 mod raw;
 pub use raw::{IntoRawMode, TerminalRestorer};
 
-// TODO Redox terminal size
-#[cfg(not(target_os = "redox"))]
 mod size;
-#[cfg(not(target_os = "redox"))]
 pub use size::terminal_size;
 
 mod color;
diff --git a/src/size.rs b/src/size.rs
index 9a5047a..695a241 100644
--- a/src/size.rs
+++ b/src/size.rs
@@ -1,11 +1,9 @@
-use libc::ioctl;
-use libc::{c_ushort, STDOUT_FILENO};
+#[cfg(not(target_os = "redox"))]
+use libc::c_ushort;
 
-use std::mem;
-
-use termios::TIOCGWINSZ;
 use TerminalError;
 
+#[cfg(not(target_os = "redox"))]
 #[repr(C)]
 struct TermSize {
     row: c_ushort,
@@ -14,9 +12,14 @@ struct TermSize {
     _y: c_ushort,
 }
 
-/// Get the size of the terminal. If the program isn't running in a terminal, it will return
-/// `None`.
+/// Get the size of the terminal.
+#[cfg(not(target_os = "redox"))]
 pub fn terminal_size() -> Result<(usize, usize), TerminalError> {
+    use libc::ioctl;
+    use libc::STDOUT_FILENO;
+    use termios::TIOCGWINSZ;
+
+    use std::mem;
     unsafe {
         let mut size: TermSize = mem::zeroed();
 
@@ -27,3 +30,18 @@ pub fn terminal_size() -> Result<(usize, usize), TerminalError> {
         }
     }
 }
+
+/// Get the size of the terminal.
+#[cfg(target_os = "redox")]
+pub fn terminal_size() -> Result<(usize, usize), TerminalError> {
+    use std::env::var;
+
+    let w = var("COLUMNS").map_err(|_| TerminalError::TermSizeError).and_then(|x| {
+        x.parse().map_err(|_| TerminalError::ParseError)
+    });
+    let h = var("LINES").map_err(|_| TerminalError::TermSizeError).and_then(|x| {
+        x.parse().map_err(|_| TerminalError::ParseError)
+    });
+
+    Ok((try!(w), try!(h)))
+}