diff --git a/bios/sys_var_en.u b/bios/sys_var_en.u
index f02e81ba7..88295f706 100644
--- a/bios/sys_var_en.u
+++ b/bios/sys_var_en.u
@@ -411,7 +411,7 @@ This variable also has to be set before a  call of Prtblk.
 !item [prv_aux~~~~~~LONG 0x512]
 Pointer to a routine for output to the  
 serial port (likewise for hardcopy routine). 
-The characer to be output lies in 6(sp).
+The character to be output lies in 6(sp).
 
 !label prv_auxo
 !label System variable, prv_auxo