diff --git a/cime_config/testdefs/testlist_clm.xml b/cime_config/testdefs/testlist_clm.xml
index cec7e775f5..2ad1f3b4d5 100644
--- a/cime_config/testdefs/testlist_clm.xml
+++ b/cime_config/testdefs/testlist_clm.xml
@@ -902,7 +902,7 @@
       <option name="comment"  >Run in DEBUG with the matrix solution on for spinup with all options it interacts with (requires Bgc, but also turn on Crop and Carbon isotopes)</option>
     </options>
   </test>
-  <test name="ERS_Ly4_Mmpi-serial" grid="1x1_numaIA" compset="I2000Clm50BgcCrop" testmods="clm/ciso_monthly_matrixcn_spinup">
+  <test name="ERS_Ld1640_Mmpi-serial" grid="1x1_numaIA" compset="I2000Clm50BgcCrop" testmods="clm/ciso_monthly_matrixcn_spinup">
     <machines>
       <machine name="derecho" compiler="intel" category="aux_clm"/>
       <machine name="derecho" compiler="intel" category="matrixcn"/>
@@ -1551,7 +1551,7 @@
       <option name="wallclock">00:20:00</option>
     </options>
   </test>
-  <test name="ERP_P64x2_Ly3" grid="f10_f10_mg37" compset="I2000Clm50BgcCrop" testmods="clm/irrig_o3falk_reduceOutput">
+  <test name="ERP_P64x2_Ld1096" grid="f10_f10_mg37" compset="I2000Clm50BgcCrop" testmods="clm/irrig_o3falk_reduceOutput">
     <machines>
       <machine name="derecho" compiler="intel" category="aux_clm"/>
     </machines>
@@ -1560,7 +1560,7 @@
       <option name="comment"  >Want a multi-year global crop restart test; this was 5 years when we were doing cold start, but 3 years is probably sufficient given that we have spun-up crop initial conditions</option>
     </options>
   </test>
-  <test name="ERP_P64x2_Ly3" grid="f10_f10_mg37" compset="I2000Clm50BgcCrop" testmods="clm/clm50cropIrrigMonth_interp">
+  <test name="ERP_P64x2_Ld1096" grid="f10_f10_mg37" compset="I2000Clm50BgcCrop" testmods="clm/clm50cropIrrigMonth_interp">
     <machines>
       <machine name="derecho" compiler="intel" category="aux_clm"/>
       <machine name="derecho" compiler="intel" category="prebeta"/>
@@ -2412,7 +2412,7 @@
     </options>
   </test>
 
-  <test name="ERS_P128x1_Ly3" grid="f10_f10_mg37" compset="I2000Clm60Fates" testmods="clm/FatesColdNoComp">
+  <test name="ERS_P128x1_Ld762" grid="f10_f10_mg37" compset="I2000Clm60Fates" testmods="clm/FatesColdNoComp">
     <machines>
       <!-- no izumi tests since this has a pe layout specific for derecho -->
       <machine name="derecho" compiler="intel"   category="aux_clm"/>
@@ -2478,7 +2478,7 @@
       <option name="comment"  >Want a debug test that tests a number of aspects of transient crops, including a new crop landunit and shifting PCT_CFT; move to CLM50 once we can get it fast enough (see bug 2391)</option>
     </options>
   </test>
-  <test name="ERS_Ly3" grid="1x1_smallvilleIA" compset="IHistClm50BgcCropQianRs" testmods="clm/smallville_dynlakes_monthly">
+  <test name="ERS_Ld761" grid="1x1_smallvilleIA" compset="IHistClm50BgcCropQianRs" testmods="clm/smallville_dynlakes_monthly">
     <machines>
       <machine name="derecho" compiler="gnu" category="aux_clm"/>
     </machines>
@@ -2487,7 +2487,7 @@
       <option name="comment">Include a test of transient lakes</option>
     </options>
   </test>
-  <test name="ERS_Ly3" grid="1x1_smallvilleIA" compset="IHistClm50BgcCropQianRs" testmods="clm/smallville_dynurban_monthly">
+  <test name="ERS_L761" grid="1x1_smallvilleIA" compset="IHistClm50BgcCropQianRs" testmods="clm/smallville_dynurban_monthly">
     <machines>
       <machine name="derecho" compiler="gnu" category="aux_clm"/>
     </machines>