diff --git a/shell.asm b/shell.asm
index f3f9799..63f0fe1 100644
--- a/shell.asm
+++ b/shell.asm
@@ -877,7 +877,7 @@ print_ls:
 ; in:
 ;  ds:si = string
 ; out:
-;  cx = stlen
+;  cx = strlen
 strlen:
 	push ax
 	push di
diff --git a/viewer.asm b/viewer.asm
index 1cb58ab..a0d3df5 100644
--- a/viewer.asm
+++ b/viewer.asm
@@ -1072,34 +1072,6 @@ request_redraw:
 	pop ax
 	ret
 
-; ------------------------------------------------------------------
-; String functions
-; ------------------------------------------------------------------
-
-; in:
-;  ds:si = string
-; out:
-;  cx = stlen
-strlen:
-	push ax
-	push di
-	push es
-
-	mov cx, ds
-	mov es, cx
-	mov di, si
-
-	mov cx, -1
-	xor ax, ax
-	repne scasb
-	not cx
-	dec cx
-
-	pop es
-	pop di
-	pop ax
-	ret
-
 ; ------------------------------------------------------------------
 ; Variables
 ; ------------------------------------------------------------------