diff --git a/src/tty/unix.rs b/src/tty/unix.rs
index 8e97bc4af..199dea9ab 100644
--- a/src/tty/unix.rs
+++ b/src/tty/unix.rs
@@ -1150,7 +1150,7 @@ impl Term for PosixTerminal {
         raw.control_chars[SCI::VMIN as usize] = 1; // One character-at-a-time input
         raw.control_chars[SCI::VTIME as usize] = 0; // with blocking read
 
-        let mut key_map: HashMap<KeyEvent, Cmd> = HashMap::with_capacity(3);
+        let mut key_map: HashMap<KeyEvent, Cmd> = HashMap::with_capacity(4);
         map_key(&mut key_map, &raw, SCI::VEOF, "VEOF", Cmd::EndOfFile);
         map_key(&mut key_map, &raw, SCI::VINTR, "VINTR", Cmd::Interrupt);
         map_key(&mut key_map, &raw, SCI::VQUIT, "VQUIT", Cmd::Interrupt);