diff --git a/cime_config/testdefs/testlist_clm.xml b/cime_config/testdefs/testlist_clm.xml
index 9e90309492..24153d15c9 100644
--- a/cime_config/testdefs/testlist_clm.xml
+++ b/cime_config/testdefs/testlist_clm.xml
@@ -2467,7 +2467,7 @@
       <option name="wallclock">00:20:00</option>
     </options>
   </test>
-  <test name="ERS_D_Ld15" grid="5x5_amazon" compset="I2000Clm50FatesRs" testmods="clm/FatesColdSeedDisp">
+  <test name="ERS_D_Ld15" grid="f10_f10_mg37" compset="I2000Clm50FatesRs" testmods="clm/FatesColdSeedDisp">
     <machines>
       <machine name="cheyenne" compiler="gnu" category="fates"/>
       <machine name="derecho" compiler="gnu" category="fates"/>
@@ -2477,7 +2477,7 @@
       <option name="comment"  >This test should be convered to an ERP test once the PEM version of this test is passing COMPARE_base_modpes.</option>
     </options>
   </test>
-  <test name="PEM_D_Ld15" grid="5x5_amazon" compset="I2000Clm50FatesRs" testmods="clm/FatesColdSeedDisp">
+  <test name="PEM_D_Ld15" grid="f10_f10_mg37" compset="I2000Clm50FatesRs" testmods="clm/FatesColdSeedDisp">
     <machines>
       <machine name="cheyenne" compiler="gnu" category="fates"/>
       <machine name="derecho" compiler="gnu" category="fates"/>