diff --git a/common/rfb/keysymdef.h b/common/rfb/keysymdef.h
index 979ebdd..a80f3f5 100644
--- a/common/rfb/keysymdef.h
+++ b/common/rfb/keysymdef.h
@@ -175,7 +175,7 @@
 
 
 /*
- * Auxilliary Functions; note the duplicate definitions for left and right
+ * Auxiliary Functions; note the duplicate definitions for left and right
  * function keys;  Sun keyboards and a few other manufactures have such
  * function key groups on the left and/or right sides of the keyboard.
  * We've not found a keyboard with more than 35 function keys total.