diff --git a/ponydos.asm b/ponydos.asm
index 34dc072..30ba7e1 100644
--- a/ponydos.asm
+++ b/ponydos.asm
@@ -337,7 +337,8 @@ open_file:
 	push bx
 	push es
 
-	; Stolen from https://stackoverflow.com/a/72746473, get strlen in cx
+	; Stolen from https://stackoverflow.com/a/72746473, get strlen (including
+	; null-termination) in cx
 	mov cx, ds
 	mov es, cx
 	mov di, si
@@ -345,7 +346,6 @@ open_file:
 	xor ax, ax
 	repne scasb
 	not cx
-	dec cx
 
 	mov es, ax
 	;mov ax, 1