diff --git a/subprojects/gst-examples/playback/player/gtk/gtk-play.c b/subprojects/gst-examples/playback/player/gtk/gtk-play.c
index 985786f3ca..fb83f6be29 100644
--- a/subprojects/gst-examples/playback/player/gtk/gtk-play.c
+++ b/subprojects/gst-examples/playback/player/gtk/gtk-play.c
@@ -97,16 +97,27 @@ typedef GtkApplicationWindowClass GtkPlayClass;
 GType gtk_play_get_type (void);
 G_DEFINE_TYPE (GtkPlay, gtk_play, GTK_TYPE_APPLICATION_WINDOW);
 
+/* *INDENT-OFF* */
+G_MODULE_EXPORT
 void rewind_button_clicked_cb (GtkButton * button, GtkPlay * play);
+G_MODULE_EXPORT
 void forward_button_clicked_cb (GtkButton * button, GtkPlay * play);
+G_MODULE_EXPORT
 void play_pause_button_clicked_cb (GtkButton * button, GtkPlay * play);
+G_MODULE_EXPORT
 void prev_button_clicked_cb (GtkButton * button, GtkPlay * play);
+G_MODULE_EXPORT
 void next_button_clicked_cb (GtkButton * button, GtkPlay * play);
+G_MODULE_EXPORT
 void media_info_dialog_button_clicked_cb (GtkButton * button, GtkPlay * play);
+G_MODULE_EXPORT
 void fullscreen_button_toggled_cb (GtkToggleButton * widget, GtkPlay * play);
+G_MODULE_EXPORT
 void seekbar_value_changed_cb (GtkRange * range, GtkPlay * play);
+G_MODULE_EXPORT
 void volume_button_value_changed_cb (GtkScaleButton * button, gdouble value,
     GtkPlay * play);
+/* *INDENT-ON* */
 
 enum
 {