diff --git a/CHANGELOG.md b/CHANGELOG.md
index 39e7dcc62..14f52e70f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -19,6 +19,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - Fixed bug in # levels with cloud used in photolysis when using GCAP met or CESM
 - Fixed typos for `SatDiagnEdge` collection in `HISTORY.rc` templates
 - The `SatDiagnOH` diagnostic now works for the carbon simulation
+- Now use proper time refresh for CO2 fossil fuel scale factors in `ExtData.rc.carbon`
 
 ### Removed
 - Entry `SatDiagnPEDGE` from the `SatDiagn` collection; This needs to go into the `SatDiagnEdge` collection.
diff --git a/run/GCHP/ExtData.rc.templates/ExtData.rc.carbon b/run/GCHP/ExtData.rc.templates/ExtData.rc.carbon
index c6f41c1fe..2c79c723d 100644
--- a/run/GCHP/ExtData.rc.templates/ExtData.rc.carbon
+++ b/run/GCHP/ExtData.rc.templates/ExtData.rc.carbon
@@ -405,8 +405,8 @@ SHIP_LEVS     1 N Y - none none cmv_c3     ./HcoDir/VerticalScaleFactors/v2021-0
 #==============================================================================
 
 # --- National fossil fuel CO2 scale factors (Nassar et al, 2013) ---
-CO2_DIURNAL 1 N    Y F%y4-%m2-%d2T%h2:00:00 none none diurnal_scale_factors ./HcoDir/CO2/v2015-04/FOSSIL/TIMES_diurnal_scale_factors.nc
-CO2_WEEKLY  1 2006 Y F%y4-%m2-%d2T00:00:00  none none weekly_scale_factors  ./HcoDir/CO2/v2015-04/FOSSIL/TIMES_weekly_scale_factors.nc
+CO2_DIURNAL 1 Y Y F2006-01-01T%h2:00:00 none none diurnal_scale_factors ./HcoDir/CO2/v2015-04/FOSSIL/TIMES_diurnal_scale_factors.nc
+CO2_WEEKLY  1 Y Y F2006-01-%d2T00:00:00  none none weekly_scale_factors  ./HcoDir/CO2/v2015-04/FOSSIL/TIMES_weekly_scale_factors.nc
 
 # --- Domestic aviation surface correction factor ---
 AVIATION_SURF_CORR      1       2004 Y F%y2-01-01T00:00:00  none none CO2 ./HcoDir/CO2/v2022-11/FOSSIL/Aviation_SurfCorr_SclFac.1x1.nc