diff --git a/namelists/real-from-dwd-ana/icon_atmosphere.namelist b/namelists/real-from-dwd-ana/icon_atmosphere.namelist
index b4789b7b2cd87b16ef9e0d9c3d8672ab3fdba6bf..ff0b00963ccdfcd564274277a4b4e18566af6805 100644
--- a/namelists/real-from-dwd-ana/icon_atmosphere.namelist
+++ b/namelists/real-from-dwd-ana/icon_atmosphere.namelist
@@ -68,6 +68,8 @@
 ! First Guess file
 &output_nml
     file_interval               = 'PT3600S'
+    output_start                = '#OUTPUT_START#'
+    output_end                  = '#OUTPUT_END#'
     output_filename             = "init"
     output_interval             = 'PT3600S'
     include_last                = .true.