diff --git a/libsrc/geos-common/conio/_scrsize.s b/libsrc/geos-common/conio/_scrsize.s
index 030e38edd..da6b2d33d 100644
--- a/libsrc/geos-common/conio/_scrsize.s
+++ b/libsrc/geos-common/conio/_scrsize.s
@@ -17,7 +17,7 @@
 .segment	"INIT"
 
 initscrsize:
-.ifdef  __GEOS_CBM__
+.ifdef __GEOS_CBM__
 	lda graphMode
 	bpl L1
 	lda #80			; 80 columns (more or less)
diff --git a/libsrc/geos-common/conio/clrscr.s b/libsrc/geos-common/conio/clrscr.s
index 47cda5cce..e8f30b700 100644
--- a/libsrc/geos-common/conio/clrscr.s
+++ b/libsrc/geos-common/conio/clrscr.s
@@ -28,7 +28,7 @@ _clrscr:
 	inx
 	stx cursor_r
 	jsr fixcursor		; home cursor
-.ifdef  __GEOS_CBM__
+.ifdef __GEOS_CBM__
 	lda #199
 	sta r2H
 	lda graphMode
diff --git a/libsrc/geos-common/disk/getptrcurdknm.s b/libsrc/geos-common/disk/getptrcurdknm.s
index 43c5fda01..d81490e21 100644
--- a/libsrc/geos-common/disk/getptrcurdknm.s
+++ b/libsrc/geos-common/disk/getptrcurdknm.s
@@ -22,7 +22,7 @@ _GetPtrCurDkNm:
 	txa
 	bne fin
 namelp:	lda (ptr4),y
-.ifdef  __GEOS_CBM__
+.ifdef __GEOS_CBM__
 	cmp #$a0
 .else
 	cmp #0
diff --git a/libsrc/geos-common/drivers/geos-stdmou.s b/libsrc/geos-common/drivers/geos-stdmou.s
index c2f610dc5..6f144d599 100644
--- a/libsrc/geos-common/drivers/geos-stdmou.s
+++ b/libsrc/geos-common/drivers/geos-stdmou.s
@@ -32,7 +32,7 @@ _mouse_init:
 	sta mouseTop
 	sta mouseLeft
 	sta mouseLeft+1
-.ifdef  __GEOS_CBM__
+.ifdef __GEOS_CBM__
 	lda #199
 	sta mouseBottom
 	lda graphMode
diff --git a/libsrc/geos-common/system/mainargs.s b/libsrc/geos-common/system/mainargs.s
index 6ee69978a..02c461cb3 100644
--- a/libsrc/geos-common/system/mainargs.s
+++ b/libsrc/geos-common/system/mainargs.s
@@ -34,7 +34,7 @@ initmainargs:
 	ldy #0
 @fn_loop:
 	lda dirEntryBuf+OFF_FNAME,y
-.ifdef  __GEOS_CBM__
+.ifdef __GEOS_CBM__
 	cmp #$a0
 .else
 	cmp #0