diff --git a/cime_config/testdefs/testlist_cam.xml b/cime_config/testdefs/testlist_cam.xml
index 600436da24..d0789ac1f3 100644
--- a/cime_config/testdefs/testlist_cam.xml
+++ b/cime_config/testdefs/testlist_cam.xml
@@ -202,6 +202,7 @@
   <test compset="QPLT" grid="ne30pg3_ne30pg3_mg17" name="ERP_D_Ln9" testmods="cam/outfrq3s_cosp">
     <machines>
       <machine name="derecho" compiler="intel" category="aux_cam"/>
+      <machine name="derecho" compiler="intel" category="prealpha"/>
     </machines>
     <options>
       <option name="wallclock">00:10:00</option>
@@ -220,6 +221,7 @@
   <test compset="QPMT" grid="ne30pg3_ne30pg3_mg17" name="ERP_D_Ln9" testmods="cam/outfrq9s">
     <machines>
       <machine name="derecho" compiler="intel" category="aux_cam"/>
+      <machine name="derecho" compiler="intel" category="prealpha"/>
     </machines>
     <options>
       <option name="wallclock">00:20:00</option>