diff --git a/drivers/edac/edac_mc.h b/drivers/edac/edac_mc.h
index fec12f72212335bd8ed41fc595805551489c71c4..fdc811d89679a0ca1256112b989f8ccbb4cbeabe 100644
--- a/drivers/edac/edac_mc.h
+++ b/drivers/edac/edac_mc.h
@@ -126,6 +126,7 @@ enum mem_type {
 	MEM_RMBS,		/* Rambus DRAM */
 	MEM_DDR2,               /* DDR2 RAM */
 	MEM_FB_DDR2,            /* fully buffered DDR2 */
+	MEM_RDDR2,              /* Registered DDR2 RAM */
 };
 
 #define MEM_FLAG_EMPTY		BIT(MEM_EMPTY)
@@ -141,6 +142,7 @@ enum mem_type {
 #define MEM_FLAG_RMBS		BIT(MEM_RMBS)
 #define MEM_FLAG_DDR2           BIT(MEM_DDR2)
 #define MEM_FLAG_FB_DDR2        BIT(MEM_FB_DDR2)
+#define MEM_FLAG_RDDR2          BIT(MEM_RDDR2)
 
 /* chipset Error Detection and Correction capabilities and mode */
 enum edac_type {