diff --git a/doc/src/neigh_modify.rst b/doc/src/neigh_modify.rst
index 63d7221c70..753990c93f 100644
--- a/doc/src/neigh_modify.rst
+++ b/doc/src/neigh_modify.rst
@@ -271,6 +271,8 @@ The value of the *page* setting must be at least 10x larger than the
 *one* setting.  This ensures neighbor pages are not mostly empty
 space.
 
+The *exclude group* setting is currently not compatible with dynamic groups.
+
 Related commands
 """"""""""""""""
 
diff --git a/src/neighbor.cpp b/src/neighbor.cpp
index 072240b482..c43f86e7ed 100644
--- a/src/neighbor.cpp
+++ b/src/neighbor.cpp
@@ -2721,7 +2721,9 @@ void Neighbor::modify_params(int narg, char **arg)
         if (ex1_group[nex_group] == -1)
           error->all(FLERR, "Invalid exclude group keyword: group {} not found", arg[iarg+2]);
         if (ex2_group[nex_group] == -1)
-            error->all(FLERR, "Invalid exclude group keyword: group {} not found", arg[iarg+3]);
+          error->all(FLERR, "Invalid exclude group keyword: group {} not found", arg[iarg+3]);
+        if (group->dynamic[ex1_group[nex_group]] || group->dynamic[ex2_group[nex_group]])
+          error->all(FLERR, "Neigh_modify exclude group is not compatible with dynamic groups");
         nex_group++;
         iarg += 4;
       } else if (strcmp(arg[iarg+1],"molecule/inter") == 0 ||