diff --git a/src/dump_custom.cpp b/src/dump_custom.cpp
index 3f60b89de2..35f6b1914c 100644
--- a/src/dump_custom.cpp
+++ b/src/dump_custom.cpp
@@ -847,6 +847,13 @@ int DumpCustom::count()
         i = nfield + ithresh;
         ptr = vbuf[field2index[i]];
         nstride = 1;
+
+      } else if (thresh_array[ithresh] == DNAME) {
+	int iwhich,tmp;
+        i = nfield + ithresh;
+	iwhich = atom->find_custom(id_custom[field2index[i]],tmp);
+        ptr = atom->dvector[iwhich];
+        nstride = 1;
       }
 
       // unselect atoms that don't meet threshhold criterion
@@ -1678,22 +1685,8 @@ int DumpCustom::modify_param(int narg, char **arg)
     // must grow field2index and argindex arrays, since access is beyond nfield
 
     } else if (strncmp(arg[1],"i_",2) == 0) {
-      thresh_array[nthresh] = INAME;
-      memory->grow(field2index,nfield+nthresh+1,"dump:field2index");
-      memory->grow(argindex,nfield+nthresh+1,"dump:argindex");
-      int n = strlen(arg[1]);
-      char *suffix = new char[n];
-      strcpy(suffix,&arg[1][2]);
-      argindex[nfield+nthresh] = 0;
-
-      int tmp = -1;
-      n = atom->find_custom(suffix,tmp);
-      if ((n < 0) || (tmp != 0))
-        error->all(FLERR,"Could not find dump modify "
-                   "custom atom integer property ID");
-
-      field2index[nfield+nthresh] = add_custom(suffix,0);
-      delete [] suffix;
+      error->all(FLERR,"Using custom per-atom integer vectors "
+                   "for dump_modify is not supported");
 
     } else error->all(FLERR,"Invalid dump_modify threshhold operator");