diff --git a/libgimp/gimpbrushchooser.c b/libgimp/gimpbrushchooser.c
index 5105e78dc0..4b7f00f503 100644
--- a/libgimp/gimpbrushchooser.c
+++ b/libgimp/gimpbrushchooser.c
@@ -134,11 +134,11 @@ gimp_brush_chooser_init (GimpBrushChooser *chooser)
   widget = gtk_button_new_with_mnemonic (_("_Browse..."));
   gtk_box_pack_start (GTK_BOX (chooser), widget, FALSE, FALSE, 0);
 
-  gimp_resource_chooser_set_drag_target (GIMP_RESOURCE_CHOOSER (chooser),
+  _gimp_resource_chooser_set_drag_target (GIMP_RESOURCE_CHOOSER (chooser),
                                                chooser->preview,
                                                &drag_target);
 
-  gimp_resource_chooser_set_clickable (GIMP_RESOURCE_CHOOSER (chooser),
+  _gimp_resource_chooser_set_clickable (GIMP_RESOURCE_CHOOSER (chooser),
                                              widget);
   gtk_widget_show (widget);
 }
diff --git a/libgimp/gimpfontchooser.c b/libgimp/gimpfontchooser.c
index 05e64bcc33..0e46cff949 100644
--- a/libgimp/gimpfontchooser.c
+++ b/libgimp/gimpfontchooser.c
@@ -91,10 +91,10 @@ gimp_font_chooser_init (GimpFontChooser *self)
 
   gtk_widget_show_all (GTK_WIDGET (self));
 
-  gimp_resource_chooser_set_drag_target (GIMP_RESOURCE_CHOOSER (self),
+  _gimp_resource_chooser_set_drag_target (GIMP_RESOURCE_CHOOSER (self),
                                          hbox, &drag_target);
 
-  gimp_resource_chooser_set_clickable (GIMP_RESOURCE_CHOOSER (self), button);
+  _gimp_resource_chooser_set_clickable (GIMP_RESOURCE_CHOOSER (self), button);
 }
 
 static void
diff --git a/libgimp/gimpgradientchooser.c b/libgimp/gimpgradientchooser.c
index c957fbff9b..3a8cf9a56b 100644
--- a/libgimp/gimpgradientchooser.c
+++ b/libgimp/gimpgradientchooser.c
@@ -128,10 +128,10 @@ gimp_gradient_chooser_init (GimpGradientChooser *self)
 
   gtk_widget_show_all (GTK_WIDGET (self));
 
-  gimp_resource_chooser_set_drag_target (GIMP_RESOURCE_CHOOSER (self),
+  _gimp_resource_chooser_set_drag_target (GIMP_RESOURCE_CHOOSER (self),
                                          self->preview, &drag_target);
 
-  gimp_resource_chooser_set_clickable (GIMP_RESOURCE_CHOOSER (self), button);
+  _gimp_resource_chooser_set_clickable (GIMP_RESOURCE_CHOOSER (self), button);
 }
 
 /* Called when dialog is closed and owning ResourceSelect button is disposed. */
diff --git a/libgimp/gimppalettechooser.c b/libgimp/gimppalettechooser.c
index dd84825aec..2474d9ddff 100644
--- a/libgimp/gimppalettechooser.c
+++ b/libgimp/gimppalettechooser.c
@@ -91,9 +91,9 @@ gimp_palette_chooser_init (GimpPaletteChooser *self)
 
   gtk_widget_show_all (GTK_WIDGET (self));
 
-  gimp_resource_chooser_set_drag_target (GIMP_RESOURCE_CHOOSER (self),
+  _gimp_resource_chooser_set_drag_target (GIMP_RESOURCE_CHOOSER (self),
                                          hbox, &drag_target);
-  gimp_resource_chooser_set_clickable (GIMP_RESOURCE_CHOOSER (self), self->button);
+  _gimp_resource_chooser_set_clickable (GIMP_RESOURCE_CHOOSER (self), self->button);
 }
 
 static void
diff --git a/libgimp/gimppatternchooser.c b/libgimp/gimppatternchooser.c
index 77df3085e1..659c9dde6d 100644
--- a/libgimp/gimppatternchooser.c
+++ b/libgimp/gimppatternchooser.c
@@ -129,10 +129,10 @@ gimp_pattern_chooser_init (GimpPatternChooser *self)
   button = gtk_button_new_with_mnemonic (_("_Browse..."));
   gtk_box_pack_start (GTK_BOX (self), button, FALSE, FALSE, 0);
 
-  gimp_resource_chooser_set_drag_target (GIMP_RESOURCE_CHOOSER (self),
+  _gimp_resource_chooser_set_drag_target (GIMP_RESOURCE_CHOOSER (self),
                                          self->preview, &drag_target);
 
-  gimp_resource_chooser_set_clickable (GIMP_RESOURCE_CHOOSER (self), button);
+  _gimp_resource_chooser_set_clickable (GIMP_RESOURCE_CHOOSER (self), button);
   gtk_widget_show (button);
 }
 
diff --git a/libgimp/gimpresourcechooser.c b/libgimp/gimpresourcechooser.c
index 838edbd6bf..d16547f4ff 100644
--- a/libgimp/gimpresourcechooser.c
+++ b/libgimp/gimpresourcechooser.c
@@ -299,7 +299,7 @@ gimp_resource_chooser_finalize (GObject *object)
 }
 
 /**
- * gimp_resource_chooser_set_drag_target:
+ * _gimp_resource_chooser_set_drag_target:
  * @chooser:            A [class@ResourceChooser]
  * @drag_region_widget: An interior widget to be a droppable region
  *                      and emit "drag-data-received" signal
@@ -314,9 +314,9 @@ gimp_resource_chooser_finalize (GObject *object)
  * Since: 3.0
  **/
 void
-gimp_resource_chooser_set_drag_target (GimpResourceChooser  *chooser,
-                                       GtkWidget            *drag_region_widget,
-                                       const GtkTargetEntry *drag_target)
+_gimp_resource_chooser_set_drag_target (GimpResourceChooser  *chooser,
+                                        GtkWidget            *drag_region_widget,
+                                        const GtkTargetEntry *drag_target)
 {
   g_return_if_fail (GIMP_IS_RESOURCE_CHOOSER (chooser));
   g_return_if_fail (drag_target != NULL);
@@ -336,7 +336,7 @@ gimp_resource_chooser_set_drag_target (GimpResourceChooser  *chooser,
 }
 
 /**
- * gimp_resource_chooser_set_clickable:
+ * _gimp_resource_chooser_set_clickable:
  * @chooser: A [class@ResourceChooser]
  * @widget:  An interior widget that emits "clicked" signal
  *
@@ -349,8 +349,8 @@ gimp_resource_chooser_set_drag_target (GimpResourceChooser  *chooser,
  * Since: 3.0
  **/
 void
-gimp_resource_chooser_set_clickable (GimpResourceChooser *chooser,
-                                     GtkWidget           *widget)
+_gimp_resource_chooser_set_clickable (GimpResourceChooser *chooser,
+                                      GtkWidget           *widget)
 {
   g_return_if_fail (GIMP_IS_RESOURCE_CHOOSER (chooser));
   g_return_if_fail (widget != NULL);
diff --git a/libgimp/gimpresourcechooser.h b/libgimp/gimpresourcechooser.h
index 413a9baae2..c9ea91d5eb 100644
--- a/libgimp/gimpresourcechooser.h
+++ b/libgimp/gimpresourcechooser.h
@@ -54,11 +54,11 @@ GtkWidget    * gimp_resource_chooser_get_label        (GimpResourceChooser  *wid
 
 /* API from below, used by subclasses e.g. GimpBrushChooser */
 
-void           gimp_resource_chooser_set_drag_target  (GimpResourceChooser  *chooser,
-                                                       GtkWidget            *drag_region_widget,
-                                                       const GtkTargetEntry *drag_target);
-void           gimp_resource_chooser_set_clickable    (GimpResourceChooser  *chooser,
-                                                       GtkWidget            *widget);
+G_GNUC_INTERNAL void  _gimp_resource_chooser_set_drag_target (GimpResourceChooser  *chooser,
+                                                              GtkWidget            *drag_region_widget,
+                                                              const GtkTargetEntry *drag_target);
+G_GNUC_INTERNAL void  _gimp_resource_chooser_set_clickable   (GimpResourceChooser  *chooser,
+                                                              GtkWidget            *widget);
 
 G_END_DECLS
 
diff --git a/libgimp/gimpui.def b/libgimp/gimpui.def
index 216b3f926c..d88d0992e5 100644
--- a/libgimp/gimpui.def
+++ b/libgimp/gimpui.def
@@ -88,8 +88,6 @@ EXPORTS
 	gimp_resource_chooser_get_label
 	gimp_resource_chooser_get_resource
 	gimp_resource_chooser_get_type
-	gimp_resource_chooser_set_clickable
-	gimp_resource_chooser_set_drag_target
 	gimp_resource_chooser_set_resource
 	gimp_ui_init
 	gimp_vector_load_procedure_dialog_get_type