diff --git a/panels/printers/pp-ppd-selection-dialog.c b/panels/printers/pp-ppd-selection-dialog.c
index bfa92f483..6851fc65a 100644
--- a/panels/printers/pp-ppd-selection-dialog.c
+++ b/panels/printers/pp-ppd-selection-dialog.c
@@ -327,7 +327,7 @@ ppd_selection_dialog_response_cb (GtkDialog *dialog,
 PpPPDSelectionDialog *
 pp_ppd_selection_dialog_new (GtkWindow            *parent,
                              PPDList              *ppd_list,
-                             gchar                *manufacturer,
+                             const gchar          *manufacturer,
                              UserResponseCallback  user_callback,
                              gpointer              user_data)
 {
diff --git a/panels/printers/pp-ppd-selection-dialog.h b/panels/printers/pp-ppd-selection-dialog.h
index 3a98ef9d5..d9217ef12 100644
--- a/panels/printers/pp-ppd-selection-dialog.h
+++ b/panels/printers/pp-ppd-selection-dialog.h
@@ -30,7 +30,7 @@ typedef struct _PpPPDSelectionDialog PpPPDSelectionDialog;
 
 PpPPDSelectionDialog *pp_ppd_selection_dialog_new                  (GtkWindow                 *parent,
                                                                     PPDList                   *ppd_list,
-                                                                    gchar                     *manufacturer,
+                                                                    const gchar               *manufacturer,
                                                                     UserResponseCallback       user_callback,
                                                                     gpointer                   user_data);
 gchar                *pp_ppd_selection_dialog_get_ppd_name         (PpPPDSelectionDialog      *dialog);
diff --git a/panels/printers/pp-utils.c b/panels/printers/pp-utils.c
index c140e37e5..68eaa9871 100644
--- a/panels/printers/pp-utils.c
+++ b/panels/printers/pp-utils.c
@@ -2991,7 +2991,7 @@ ppd_list_free (PPDList *list)
 }
 
 gchar *
-get_standard_manufacturers_name (gchar *name)
+get_standard_manufacturers_name (const gchar *name)
 {
   gchar *normalized_name;
   gchar *result = NULL;
diff --git a/panels/printers/pp-utils.h b/panels/printers/pp-utils.h
index 97239845c..ac1c3b7de 100644
--- a/panels/printers/pp-utils.h
+++ b/panels/printers/pp-utils.h
@@ -213,7 +213,7 @@ IPPAttribute *ipp_attribute_copy (IPPAttribute *attr);
 
 void        ipp_attribute_free (IPPAttribute *attr);
 
-gchar      *get_standard_manufacturers_name (gchar *name);
+gchar      *get_standard_manufacturers_name (const gchar *name);
 
 typedef void (*PGPCallback) (const gchar *ppd_filename,
                              gpointer     user_data);