diff --git a/board/siemens/corvus/board.c b/board/siemens/corvus/board.c
index d74743f..3294203 100644
--- a/board/siemens/corvus/board.c
+++ b/board/siemens/corvus/board.c
@@ -149,7 +149,7 @@
 	ddr2_conf(&ddr2);
 
 	/* enable DDR2 clock */
-	writel(0x4, &pmc->scer);
+	writel(AT91_PMC_DDR, &pmc->scer);
 
 	/* DDRAM2 Controller initialize */
 	ddr2_init(ATMEL_BASE_DDRSDRC0, ATMEL_BASE_CS6, &ddr2);