diff --git a/conf/common/expdef.yml b/conf/common/expdef.yml
index 6915db6f518af7ba566980711e723312317af7df..fd7b15e4dd05fa96597745af32d6945b07c6fa87 100644
--- a/conf/common/expdef.yml
+++ b/conf/common/expdef.yml
@@ -2,7 +2,7 @@ experiment:
   DATELIST: 20201001
   MEMBERS: "fc0"
   CHUNKSIZEUNIT: hour
-  CHUNKSIZE: 12
+  CHUNKSIZE: 1
   NUMCHUNKS: 2
   CHUNKINI: 0
   CALENDAR: standard
\ No newline at end of file