diff --git a/parm/soca/letkf/soca_fix_stage.yaml.j2 b/parm/soca/letkf/soca_fix_stage.yaml.j2
index 6563dfdfb..50a61133a 100644
--- a/parm/soca/letkf/soca_fix_stage.yaml.j2
+++ b/parm/soca/letkf/soca_fix_stage.yaml.j2
@@ -2,7 +2,7 @@
 # fix files to copy
 ######################################
 copy:
-- ["{{ SOCA_INPUT_FIX_DIR }}/rossrad.dat", "{{ DATA }}/rossrad.dat"]
+- ["{{ SOCA_INPUT_FIX_DIR }}/rossrad.nc", "{{ DATA }}/rossrad.nc"]
 - ["{{ SOCA_INPUT_FIX_DIR }}/field_table", "{{ DATA }}/field_table"]
 - ["{{ SOCA_INPUT_FIX_DIR }}/diag_table", "{{ DATA }}/diag_table"]
 - ["{{ SOCA_INPUT_FIX_DIR }}/MOM_input", "{{ DATA }}/MOM_input"]