diff --git a/arch/x86/platform/olpc/olpc-xo1-sci.c b/arch/x86/platform/olpc/olpc-xo1-sci.c
index 30751b42d54e..97eb4738d602 100644
--- a/arch/x86/platform/olpc/olpc-xo1-sci.c
+++ b/arch/x86/platform/olpc/olpc-xo1-sci.c
@@ -311,12 +311,13 @@ static int xo1_sci_resume(struct platform_device *pdev)
 
 static int setup_sci_interrupt(struct platform_device *pdev)
 {
-	u32 lo, hi;
+	u64 msr;
+	u32 lo;
 	u32 sts;
 	int r;
 
-	rdmsr(0x51400020, lo, hi);
-	sci_irq = (lo >> 20) & 15;
+	rdmsrq(0x51400020, msr);
+	sci_irq = (msr >> 20) & 15;
 
 	if (sci_irq) {
 		dev_info(&pdev->dev, "SCI is mapped to IRQ %d\n", sci_irq);
@@ -324,8 +325,8 @@ static int setup_sci_interrupt(struct platform_device *pdev)
 		/* Zero means masked */
 		dev_info(&pdev->dev, "SCI unmapped. Mapping to IRQ 3\n");
 		sci_irq = 3;
-		lo |= 0x00300000;
-		wrmsrq(0x51400020, lo);
+		msr |= 0x00300000;
+		wrmsrq(0x51400020, msr);
 	}
 
 	/* Select level triggered in PIC */