diff --git a/test/reference/ddr4_init.h b/test/reference/ddr4_init.h
index 92c7d72..0d0a328 100644
--- a/test/reference/ddr4_init.h
+++ b/test/reference/ddr4_init.h
@@ -25,7 +25,7 @@
 #define SDRAM_PHY_READ_LEVELING_CAPABLE
 #define SDRAM_PHY_MODULES DFII_PIX_DATA_BYTES/2
 #define SDRAM_PHY_DELAYS 512
-#define SDRAM_PHY_BITSLIPS 16
+#define SDRAM_PHY_BITSLIPS 8
 
 static void cdelay(int i);