diff --git a/include/arch/x86/msr.h b/include/arch/x86/msr.h
index d765556743..b348cabdb6 100644
--- a/include/arch/x86/msr.h
+++ b/include/arch/x86/msr.h
@@ -23,11 +23,11 @@
 /* standard MSR operations, everyone has written these one hundred times */
 struct msr 
 {
-	unsigned lo;
-	unsigned hi;
+	u32 lo;
+	u32 hi;
 };
 
-static inline struct msr  rdmsr(unsigned index)
+static inline struct msr rdmsr(unsigned index)
 {
 	struct msr  result;
 	__asm__ __volatile__ (