diff --git a/compiler/res/prog8lib/c128/diskio.p8 b/compiler/res/prog8lib/c128/diskio.p8
new file mode 100644
index 000000000..7c3768a5e
--- /dev/null
+++ b/compiler/res/prog8lib/c128/diskio.p8
@@ -0,0 +1,4 @@
+%import shared_cbm_diskio
+
+; No alterations here; everything is taken from the shared module.
+
diff --git a/compiler/res/prog8lib/c64/diskio.p8 b/compiler/res/prog8lib/c64/diskio.p8
new file mode 100644
index 000000000..7c3768a5e
--- /dev/null
+++ b/compiler/res/prog8lib/c64/diskio.p8
@@ -0,0 +1,4 @@
+%import shared_cbm_diskio
+
+; No alterations here; everything is taken from the shared module.
+
diff --git a/compiler/res/prog8lib/diskio.p8 b/compiler/res/prog8lib/shared_cbm_diskio.p8
similarity index 99%
rename from compiler/res/prog8lib/diskio.p8
rename to compiler/res/prog8lib/shared_cbm_diskio.p8
index 0d9ab649e..a29720377 100644
--- a/compiler/res/prog8lib/diskio.p8
+++ b/compiler/res/prog8lib/shared_cbm_diskio.p8
@@ -1,4 +1,4 @@
-; C64/C128 disk drive I/O routines.
+; shared CBM (C64/C128) disk drive I/O routines.
 
 %import textio
 %import conv
@@ -6,7 +6,7 @@
 %import syslib
 
 diskio {
-    %option no_symbol_prefixing, ignore_unused
+    %option merge, no_symbol_prefixing, ignore_unused
 
     const ubyte READ_IO_CHANNEL=12
     const ubyte WRITE_IO_CHANNEL=13