diff --git a/core/datainput.gms b/core/datainput.gms
index 4d575098b..567f4388c 100644
--- a/core/datainput.gms
+++ b/core/datainput.gms
@@ -1527,13 +1527,14 @@ pm_macBaseMagpie(ttot,regi,emiMacMagpie(enty))$(ttot.val ge 2005) = f_macBaseMag
 *** pm_macBaseMagpie gets updated in core/presolve.gms when coupling to MAgPIE is active
 
 *** In case of fixing, load p_co2lucSub from input_ref.gdx, since parameters are not automatically treated by the fixing mechanism.
-*** Years >= cm_startyear get their values from the lookup table 
+*** Years >= cm_startyear get their values from the lookup table rather than the input_ref.gdx (see below).
 if( (cm_startyear gt 2005),
     Execute_Loadpoint "input_ref" p_co2lucSub = p_co2lucSub;
 );
 
-*** p_co2lucSub gets updated in core/presolve.gms when coupling to MAgPIE is active
-*** Overwrite values >= cm_startyear with lookup table, leave values < cm_startyear untouched (from input_ref.gdx, see above)
+
+*** Overwrite values >= cm_startyear with lookup table, leave values < cm_startyear untouched (from input_ref.gdx, see above).
+*** Gets updated for >= cm_startyear in core/presolve.gms when coupling to MAgPIE is active.
 p_co2lucSub(ttot,regi,emiMacMagpieCO2Sub(all_enty))$(ttot.val ge cm_startyear) = f_macBaseMagpie(ttot,regi,emiMacMagpieCO2Sub,"%cm_LU_emi_scen%","%cm_rcp_scen%");
 
 *** p_macPolCO2luc defines the lower limit for abatement of CO2 landuse change emissions in REMIND
diff --git a/core/presolve.gms b/core/presolve.gms
index df00a7cc7..b63eb97f8 100644
--- a/core/presolve.gms
+++ b/core/presolve.gms
@@ -127,7 +127,7 @@ if (sm_magpieIter gt 0,
 *** MAgPIE has run once at least: the start values for pm_macBaseMagpie come from the last MAgPIE iteration
   Execute_Loadpoint 'magpieData.gdx' f_macBaseMagpie_coupling;
   pm_macBaseMagpie(ttot,regi,emiMacMagpie(enty))$(ttot.val ge 2005)  = f_macBaseMagpie_coupling(ttot,regi,emiMacMagpie);
-  p_co2lucSub(ttot,regi,emiMacMagpieCO2Sub(all_enty))$(ttot.val ge 2005) = f_macBaseMagpie_coupling(ttot,regi,emiMacMagpieCO2Sub);
+  p_co2lucSub(ttot,regi,emiMacMagpieCO2Sub(all_enty))$(ttot.val ge cm_startyear) = f_macBaseMagpie_coupling(ttot,regi,emiMacMagpieCO2Sub);
 *** Biomass emission factor is set to zero after MAgPIE has run at least one, since biomass emissions are included in the emissions imported above. 
   p_efFossilFuelExtr(regi,"pebiolc","n2obio") = 0.0;
 *** In coupling mode LU emissions are abated in MAgPIE (moved here from core/datainput.gms)