diff --git a/arch/arm/mach-imx/speed-imx35.c b/arch/arm/mach-imx/speed-imx35.c
index 1721079..c5a31c7 100644
--- a/arch/arm/mach-imx/speed-imx35.c
+++ b/arch/arm/mach-imx/speed-imx35.c
@@ -74,9 +74,11 @@
 {
 	unsigned long pdr0 = readl(IMX_CCM_BASE + CCM_PDR0);
 	struct arm_ahb_div *aad;
-	unsigned long fref = imx_get_armclk();
+	unsigned long fref = imx_get_mpllclk();
 
 	aad = &clk_consumer[(pdr0 >> 16) & 0xf];
+	if (aad->sel)
+		fref = fref * 3 / 4;
 
 	return fref / aad->ahb;
 }