diff --git a/arch/ppc/ddr-8xxx/ctrl_regs.c b/arch/ppc/ddr-8xxx/ctrl_regs.c
index 3f8ecf7..1abc826 100644
--- a/arch/ppc/ddr-8xxx/ctrl_regs.c
+++ b/arch/ppc/ddr-8xxx/ctrl_regs.c
@@ -314,7 +314,7 @@
 		   | ((rtt & 0x1) << 2));
 
 	/* Write recovery */
-	wr = (dimm->tWR_ps + mclk_ps - 1) / (mclk_ps - 1);
+	wr = ((dimm->tWR_ps + mclk_ps - 1) / mclk_ps) - 1;
 
 	switch (popts->burst_length) {
 	case DDR_BL4: