diff --git a/glib/test-poppler-glib.c b/glib/test-poppler-glib.c
index 50e3ed2..5a3fc5e 100644
--- a/glib/test-poppler-glib.c
+++ b/glib/test-poppler-glib.c
@@ -232,6 +232,8 @@ form_field_button_print (PopplerFormField *field)
       case POPPLER_FORM_BUTTON_RADIO:
         button_type_str = "Radio Button";
 	break;
+    default:
+        g_assert_unreached();
     }
   
   printf ("\t\tType:\t\tButton\n");