diff --git a/packages/rtl-extra/src/atari/printer.pp b/packages/rtl-extra/src/atari/printer.pp
index 5d9928b94c..a3363c45c1 100644
--- a/packages/rtl-extra/src/atari/printer.pp
+++ b/packages/rtl-extra/src/atari/printer.pp
@@ -24,6 +24,6 @@ implementation
 
 begin
   (* WARNING: has to be checked; do_open('PRN') returns a valid, negative OS handle *)
-  InitPrinter ('PRN');
+  InitPrinter ('PRN:');
   SetPrinterExit;
 end.