diff --git a/lib/qra/q65/q65_avg.f90 b/lib/qra/q65/q65_avg.f90
index 7ff7724be..9d605fb72 100644
--- a/lib/qra/q65/q65_avg.f90
+++ b/lib/qra/q65/q65_avg.f90
@@ -51,6 +51,7 @@ subroutine q65_avg(nutc,ntrperiod,LL,ntol,lclearave,baud,nsubmode,   &
 
 ! Save data for message averaging
   nsave=nsave+1
+  nsave=mod(nsave-1,MAXAVE)+1
   n=nutc
   if(ntrperiod.ge.60) n=100*n
   write(cutc,'(i6.6)') n