diff --git a/modules/printbackends/gtkprintbackendcups.c b/modules/printbackends/gtkprintbackendcups.c
index 6453e824d9..f3435b57bb 100644
--- a/modules/printbackends/gtkprintbackendcups.c
+++ b/modules/printbackends/gtkprintbackendcups.c
@@ -647,7 +647,9 @@ add_cups_options (const char *key,
                           custom_value = TRUE;
                           break;
 
+#if CUPS_VERSION_MAJOR == 2 && CUPS_VERSION_MINOR >= 3
                         case PPD_CUSTOM_UNKNOWN:
+#endif
                         default :
                           custom_value = FALSE;
                         }