diff --git a/libsrc/cbm/diskinit.s b/libsrc/cbm/diskinit.s
index d84123a06..8a83a0212 100644
--- a/libsrc/cbm/diskinit.s
+++ b/libsrc/cbm/diskinit.s
@@ -21,7 +21,7 @@
         tax
         jsr     isdisk
         bcc     open
-        lda     #9              ; "Ilegal device"
+        lda     #9              ; "Illegal device"
         rts
 
 ; Open channel
diff --git a/libsrc/cbm/oserrlist.s b/libsrc/cbm/oserrlist.s
index c85723910..b856ed0a8 100644
--- a/libsrc/cbm/oserrlist.s
+++ b/libsrc/cbm/oserrlist.s
@@ -48,7 +48,7 @@ __sys_oserrlist:
         sys_oserr_entry          6, "File not input"
         sys_oserr_entry          7, "File not output"
         sys_oserr_entry          8, "Filename missing"
-        sys_oserr_entry          9, "Ilegal device"
+        sys_oserr_entry          9, "Illegal device"
         sys_oserr_entry         20, "Read error"
         sys_oserr_entry         21, "Read error"
         sys_oserr_entry         22, "Read error"
diff --git a/libsrc/cbm/oserror.s b/libsrc/cbm/oserror.s
index 29980548a..6df0d6711 100644
--- a/libsrc/cbm/oserror.s
+++ b/libsrc/cbm/oserror.s
@@ -40,7 +40,7 @@ ErrTab:
         .byte   6, EINVAL       ; File not input
         .byte   7, EINVAL       ; File not output
         .byte   8, EINVAL       ; Filename missing
-        .byte   9, ENODEV       ; Ilegal device
+        .byte   9, ENODEV       ; Illegal device
 ;       .byte  20,              ; Read error
 ;       .byte  21,              ; Read error
 ;       .byte  22,              ; Read error
diff --git a/libsrc/cbm/syschdir.s b/libsrc/cbm/syschdir.s
index 78b2df82d..9361d56f0 100644
--- a/libsrc/cbm/syschdir.s
+++ b/libsrc/cbm/syschdir.s
@@ -74,7 +74,7 @@ init:   txa
 
 ; Return with error in A
 
-err:    lda     #9              ; "Ilegal device"
+err:    lda     #9              ; "Illegal device"
 done:   rts
 
 .endproc
@@ -92,4 +92,4 @@ done:   rts
 @L0:    cmp     #10
         rts
 
-.endproc
\ No newline at end of file
+.endproc