diff --git a/kilo.c b/kilo.c
index 2c825b0..9f3bb12 100644
--- a/kilo.c
+++ b/kilo.c
@@ -7,6 +7,10 @@
 #include <termios.h>
 #include <unistd.h>
 
+/*** defines ***/
+
+#define CTRL_KEY(k) ((k) & 0x1f)
+
 /*** data ***/
 
 struct termios orig_termios;
@@ -57,7 +61,7 @@ int main() {
         } else {
             printf("%d ('%c')\r\n", c, c);
         }
-        if (c == 'q')
+        if (c == CTRL_KEY('q'))
             break;
     }
     return 0;