diff --git a/libsrc/plus4/plus4-stdser.s b/libsrc/plus4/plus4-stdser.s
index a5aace9f4..e09c5ab90 100644
--- a/libsrc/plus4/plus4-stdser.s
+++ b/libsrc/plus4/plus4-stdser.s
@@ -342,7 +342,7 @@ STATUS: lda    	ACIA_STATUS
 
 IOCTL:  lda     #<SER_ERR_INV_IOCTL     ; We don't support ioclts for now
         ldx     #>SER_ERR_INV_IOCTL
-;       rts				; Run into IRQ instead
+        rts				; Run into IRQ instead
 
 ;----------------------------------------------------------------------------
 ; IRQ: Called from the builtin runtime IRQ handler as a subroutine. All