diff --git a/lqr/gimp-lqr-plugin/src/interface_I.c b/lqr/gimp-lqr-plugin/src/interface_I.c
index 2719167..dbe2717 100644
--- a/lqr/gimp-lqr-plugin/src/interface_I.c
+++ b/lqr/gimp-lqr-plugin/src/interface_I.c
@@ -73,10 +73,10 @@ static void callback_alarm_triggered (GtkWidget * size_entry, gpointer data);
 
 gint dialog_I_response = GTK_RESPONSE_OK;
 
-PlugInUIVals *ui_state;
-PlugInVals *state;
-PlugInDialogVals *dialog_state;
-gboolean features_are_sensitive;
+extern PlugInUIVals *ui_state;
+extern PlugInVals *state;
+extern PlugInDialogVals *dialog_state;
+extern gboolean features_are_sensitive;
 InterfaceIData interface_I_data;
 //volatile sig_atomic_t interface_locked = 0;
 
diff --git a/lqr/gimp-lqr-plugin/src/interface_aux.c b/lqr/gimp-lqr-plugin/src/interface_aux.c
index 6461757..ceed0d9 100644
--- a/lqr/gimp-lqr-plugin/src/interface_aux.c
+++ b/lqr/gimp-lqr-plugin/src/interface_aux.c
@@ -49,11 +49,11 @@ static void callback_dialog_aux_response (GtkWidget * dialog, gint response_id,
 
 gint dialog_aux_response = GTK_RESPONSE_OK;
 
-PlugInUIVals *ui_state;
-PlugInVals *state;
-PlugInDialogVals *dialog_state;
+extern PlugInUIVals *ui_state;
+extern PlugInVals *state;
+extern PlugInDialogVals *dialog_state;
 
-GtkWidget *dlg;
+extern GtkWidget *dlg;
 
 /***  Public functions  ***/