diff --git a/epan/uat.c b/epan/uat.c
index fdf93f5524..64a888e141 100644
--- a/epan/uat.c
+++ b/epan/uat.c
@@ -232,6 +232,7 @@ static void putfld(FILE* fp, void* rec, uat_field_t* f) {
     f->cb.tostr(rec,&fld_ptr,&fld_len,f->cbdata.tostr,f->fld_data);
 
     switch(f->mode){
+        case PT_TXTMOD_NONE:
         case PT_TXTMOD_ENUM:
         case PT_TXTMOD_FILENAME:
         case PT_TXTMOD_DIRECTORYNAME:
diff --git a/epan/uat.h b/epan/uat.h
index 682c4b1e2c..f127d27420 100644
--- a/epan/uat.h
+++ b/epan/uat.h
@@ -472,6 +472,9 @@ static void basename ## _ ## field_name ## _tostr_cb(void* rec, const char** out
 #define UAT_FLD_DEC(basename,field_name,title,desc) \
 	{#field_name, title, PT_TXTMOD_STRING,{uat_fld_chk_num_dec,basename ## _ ## field_name ## _set_cb,basename ## _ ## field_name ## _tostr_cb},{0,0,0},0,desc,FLDFILL}
 
+#define UAT_FLD_NONE(basename,field_name,title,desc) \
+	{#field_name, title, PT_TXTMOD_NONE,{uat_fld_chk_num_dec,basename ## _ ## field_name ## _set_cb,basename ## _ ## field_name ## _tostr_cb},{0,0,0},0,desc,FLDFILL}
+
 
 /*
  * HEX Macros,
diff --git a/ui/gtk/uat_gui.c b/ui/gtk/uat_gui.c
index 95a5d53dfb..bd566095c8 100644
--- a/ui/gtk/uat_gui.c
+++ b/ui/gtk/uat_gui.c
@@ -180,6 +180,7 @@ static char *fld_tostr(void *rec, uat_field_t *f) {
 	f->cb.tostr(rec, &ptr, &len, f->cbdata.tostr, f->fld_data);
 
 	switch(f->mode) {
+	    case PT_TXTMOD_NONE:
 		case PT_TXTMOD_STRING:
 		case PT_TXTMOD_ENUM:
 		case PT_TXTMOD_FILENAME:
@@ -352,6 +353,7 @@ static gboolean uat_dlg_cb(GtkWidget *win _U_, gpointer user_data) {
 				len = (unsigned) strlen(text);
 				break;
 			}
+			case PT_TXTMOD_NONE: break;
 			default:
 				g_assert_not_reached();
 				return FALSE;
@@ -526,6 +528,7 @@ static void uat_edit_dialog(uat_t *uat, gint row, gboolean copy) {
 				ws_gtk_grid_attach_defaults(GTK_GRID(main_grid), entry, 1, colnum, 1, 1);
 				break;
 
+			case PT_TXTMOD_NONE:
 			case PT_TXTMOD_STRING:
 			case PT_TXTMOD_HEXBYTES:
 				entry = gtk_entry_new();
@@ -534,7 +537,10 @@ static void uat_edit_dialog(uat_t *uat, gint row, gboolean copy) {
 				}
 				g_ptr_array_add(dd->entries, entry);
 				ws_gtk_grid_attach_defaults(GTK_GRID(main_grid), entry, 1, colnum, 1, 1);
-				dlg_set_activate(entry, bt_ok);
+				if (f[colnum].mode != PT_TXTMOD_NONE)
+					dlg_set_activate(entry, bt_ok);
+				else
+					gtk_editable_set_editable(GTK_EDITABLE(entry), FALSE);
 				break;
 
 			case PT_TXTMOD_ENUM: {
diff --git a/ui/qt/uat_dialog.cpp b/ui/qt/uat_dialog.cpp
index ff05905a0d..9966418f80 100644
--- a/ui/qt/uat_dialog.cpp
+++ b/ui/qt/uat_dialog.cpp
@@ -164,6 +164,7 @@ QString UatDialog::fieldString(guint row, guint column)
     field->cb.tostr(rec, &str, &length, field->cbdata.tostr, field->fld_data);
 
     switch(field->mode) {
+    case PT_TXTMOD_NONE:
     case PT_TXTMOD_STRING:
     case PT_TXTMOD_ENUM:
     case PT_TXTMOD_FILENAME:
@@ -291,6 +292,7 @@ void UatDialog::on_uatTreeWidget_itemActivated(QTreeWidgetItem *item, int column
         saved_combo_idx_ = cur_combo_box_->currentIndex();
         break;
     }
+    case PT_TXTMOD_NONE: break;
     default:
         g_assert_not_reached();
         break;