diff --git a/Programs/CosmOS/Source/cosmos.asm b/Programs/CosmOS/Source/cosmos.asm
index 4ce700e..9f8ccef 100644
--- a/Programs/CosmOS/Source/cosmos.asm
+++ b/Programs/CosmOS/Source/cosmos.asm
@@ -1691,18 +1691,9 @@ handlePrintString:
 handleReadLine:
   CALL readLine
 
-  ; readLine works out how long the line was, and RETI would throw that away: it restores
-  ; every register from the frame, which is exactly what makes an interrupt safe to arrive
-  ; unannounced and exactly what stops a service answering. So the answer is written into
-  ; the frame, over the saved Q, and RETI puts it back as though the caller had computed it.
-  ;
-  ; This has to be here rather than in a routine, because the offset is from where the
-  ; Stack Pointer is now and a CALL moves it by ten.
-  MVQA
-  MVSD.1
-  DPUP.1 0d02
-  STA.1
-  RETI
+  ; readLine works out how long the line was, and it is already in Q where readLine left
+  ; it. SRET keeps Q and DP3 and puts everything else back, so the answer simply stands.
+  SRET
 
 ; What the program was asked to work on. DP0 says where to put it and B how much room
 ; there is, counting the zero on the end, which is the same bargain readLine offers.