diff --git a/namelists/event-generator/icon_atmosphere.namelist b/namelists/event-generator/icon_atmosphere.namelist
index 92a49a234caa38337f55d2a7432d5a5839e35ff8..aa85e833583d77bbced13e0be0eed3acfad4d664 100644
--- a/namelists/event-generator/icon_atmosphere.namelist
+++ b/namelists/event-generator/icon_atmosphere.namelist
@@ -105,7 +105,7 @@
 /
 
 &io_nml
-    lnetcdf_flt64_output        = .true.
+    lnetcdf_flt64_output        = .false.
 /