diff --git a/namelists/event-generator/icon_atmosphere.namelist b/namelists/event-generator/icon_atmosphere.namelist
index ff0b00963ccdfcd564274277a4b4e18566af6805..bd0840c464ddcd1ad579dc68bb75dba43eda2edd 100644
--- a/namelists/event-generator/icon_atmosphere.namelist
+++ b/namelists/event-generator/icon_atmosphere.namelist
@@ -18,7 +18,7 @@
 
 &grid_nml
     dynamics_parent_grid_id     = 0
-    lredgrid_phys               = .true.
+    lredgrid_phys               = .false.
 /
 
 &extpar_nml