diff --git a/src/gsi/read_radar.f90 b/src/gsi/read_radar.f90
index 8e5de5aff9..40c77a7ee2 100644
--- a/src/gsi/read_radar.f90
+++ b/src/gsi/read_radar.f90
@@ -341,7 +341,7 @@ subroutine read_radar(nread,ndata,nodata,infile,lunout,obstype,twind,sis,hgtl_fu
   if (.not.lexist1 .and. .not.lexist2 .and. .not.lexist3) return
 
   eradkm=rearth*0.001_r_kind
-  maxobs=2e8
+  maxobs=4e6
   nreal=maxdat
   nchanl=0
   ilon=2