diff --git a/libsrc/atari7800/clrscr.s b/libsrc/atari7800/clrscr.s
index 9d063fad6..7ce690af4 100644
--- a/libsrc/atari7800/clrscr.s
+++ b/libsrc/atari7800/clrscr.s
@@ -11,8 +11,8 @@
 
         .proc _clrscr
 
-        lda	#<_screen
-        ldx	#>_screen
+        lda     #<_screen
+        ldx     #>_screen
         sta     ptr7800
         stx     ptr7800+1
         ldx     #screenrows
diff --git a/libsrc/atari7800/conio.s b/libsrc/atari7800/conio.s
index 5b60f39fe..1240c2e5d 100644
--- a/libsrc/atari7800/conio.s
+++ b/libsrc/atari7800/conio.s
@@ -212,8 +212,8 @@ vblankoff:
         sta     CTRL
         lda     #$00            ; Black background
         sta     BKGRND
-	sta	CURS_X
-	sta	CURS_Y
+        sta     CURS_X
+        sta     CURS_Y
         lda     #$33            ; Red
         sta     P0C1
         lda     #$c8            ; Green
diff --git a/libsrc/atari7800/extzp.s b/libsrc/atari7800/extzp.s
index a79ede01a..8e8b73459 100644
--- a/libsrc/atari7800/extzp.s
+++ b/libsrc/atari7800/extzp.s
@@ -11,5 +11,5 @@
 ptr7800:        .res 2
 ptrtmp:         .res 2
 cursorzone:     .res 2
-CURS_X:		.res 1
-CURS_Y:		.res 1
+CURS_X:         .res 1
+CURS_Y:         .res 1