diff --git a/namelists/icon_atmosphere_real-from-ideal_01.namelist b/namelists/icon_atmosphere_real-from-ideal_01.namelist
index e4c0b8963a36232a9d9e31d8939f2028dcf60e60..41eb39e5c1c8de430527025e7d626edc9a46dfe4 100644
--- a/namelists/icon_atmosphere_real-from-ideal_01.namelist
+++ b/namelists/icon_atmosphere_real-from-ideal_01.namelist
@@ -46,7 +46,7 @@
 &output_nml
     file_interval               = 'PT3600S'
     output_start                = '%Chunk_START_DATE%'
-    output_end                  = %Chunk_END_DATE%'
+    output_end                  = '%Chunk_END_DATE%'
     output_filename             = "init-test"
     output_interval             = 'PT3600S'
     include_last                = .true.