diff --git a/pony_spi.c b/pony_spi.c
index fba7fb7..22f5f02 100644
--- a/pony_spi.c
+++ b/pony_spi.c
@@ -224,7 +224,7 @@
 		return 1;
 	}
 
-	if (register_spi_bitbang_master(&bitbang_spi_master_pony)) {
+	if (register_spi_bitbang_master(&bitbang_spi_master_pony, NULL)) {
 		return 1;
 	}
 	return 0;