diff --git a/.gitmodules b/.gitmodules
index dc0798c32..1b9e6c12a 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -4,8 +4,10 @@
 	branch = main
 [submodule "ccpp-physics"]
 	path = ccpp/physics
-	url = https://github.com/NCAR/ccpp-physics
-	branch = main
+	#url = https://github.com/NCAR/ccpp-physics
+	#branch = main
+        url = https://github.com/grantfirl/ccpp-physics
+        branch = ufs-dev-PR88
 [submodule "CMakeModules"]
 	path = CMakeModules
 	url = https://github.com/noaa-emc/CMakeModules
diff --git a/ccpp/physics b/ccpp/physics
index c83cd1714..e1ccc99c6 160000
--- a/ccpp/physics
+++ b/ccpp/physics
@@ -1 +1 @@
-Subproject commit c83cd1714c9674f87944a48d82c287ce1660d226
+Subproject commit e1ccc99c6eb48b6700513c4bb4315fca131fbd6a
diff --git a/scm/src/CCPP_typedefs.F90 b/scm/src/CCPP_typedefs.F90
index 6be455d89..80de0fc9a 100644
--- a/scm/src/CCPP_typedefs.F90
+++ b/scm/src/CCPP_typedefs.F90
@@ -867,6 +867,8 @@ subroutine gfs_interstitial_setup_tracers(Interstitial, Model)
     if (Model%imp_physics == Model%imp_physics_thompson) then
       if (Model%ltaerosol) then
         Interstitial%nvdiff = 12
+     else if (Model%mraerosol) then
+        Interstitial%nvdiff = 10
       else
         Interstitial%nvdiff = 9
       endif
@@ -956,6 +958,8 @@ subroutine gfs_interstitial_setup_tracers(Interstitial, Model)
       elseif (Model%imp_physics == Model%imp_physics_thompson) then
         if (Model%ltaerosol) then
           Interstitial%nvdiff = 12
+        else if (Model%mraerosol) then
+          Interstitial%nvdiff = 10
         else
           Interstitial%nvdiff = 9
         endif