diff --git a/libsrc/atari5200/cartentry.s b/libsrc/atari5200/cartentry.s
index e69426b65..431843a55 100644
--- a/libsrc/atari5200/cartentry.s
+++ b/libsrc/atari5200/cartentry.s
@@ -3,8 +3,8 @@
 ; Christian Groessler, 01-Mar-2014
 
 .export         __CART_ENTRY__: absolute = 1
-.import		__CARTSIZE__, start
-.forceimport	__CART_YEAR__, __CART_NAME__
+.import         __CARTSIZE__, start
+.forceimport    __CART_YEAR__, __CART_NAME__
 
 .segment        "CARTENTRY"
 
diff --git a/libsrc/atari5200/cartname.s b/libsrc/atari5200/cartname.s
index 51a7ca2bd..e8478362b 100644
--- a/libsrc/atari5200/cartname.s
+++ b/libsrc/atari5200/cartname.s
@@ -2,10 +2,10 @@
 ;
 ; Christian Groessler, 01-Mar-2014
 
-.include	"atari5200.mac"
+.include        "atari5200.mac"
 
 .export         __CART_NAME__: absolute = 1
 
 .segment        "CARTNAME"
 
-		scrcode "   cc65 compiled"
+                scrcode "   cc65 compiled"
diff --git a/libsrc/atari5200/cartyear.s b/libsrc/atari5200/cartyear.s
index 85d819632..3269b5cb3 100644
--- a/libsrc/atari5200/cartyear.s
+++ b/libsrc/atari5200/cartyear.s
@@ -2,11 +2,11 @@
 ;
 ; Christian Groessler, 01-Mar-2014
 
-.include	"atari5200.mac"
+.include        "atari5200.mac"
 
 .export         __CART_YEAR__: absolute = 1
 
 .segment        "CARTYEAR"
 
-		scrcode "98"
+                scrcode "98"
 
diff --git a/libsrc/atari5200/cputc.s b/libsrc/atari5200/cputc.s
index 976f910f0..4bee0fba2 100644
--- a/libsrc/atari5200/cputc.s
+++ b/libsrc/atari5200/cputc.s
@@ -14,9 +14,9 @@
         .importzp       ptr4
         .import         setcursor
 
-	.constructor	screen_setup, 26
-	.import		screen_setup_20x24
-screen_setup	= screen_setup_20x24
+        .constructor    screen_setup, 26
+        .import         screen_setup_20x24
+screen_setup    = screen_setup_20x24
 
 
 _cputcxy: