diff --git a/common/include/intrin_x86.h b/common/include/intrin_x86.h
index 8034048193..658ad518d2 100644
--- a/common/include/intrin_x86.h
+++ b/common/include/intrin_x86.h
@@ -591,7 +591,7 @@ static __inline__ __attribute__((always_inline)) void __addfsdword(const unsigne
 /*** Bit manipulation ***/
 static  __inline__ __attribute__((always_inline)) unsigned char _BitScanForward(unsigned long * const Index, const unsigned long Mask)
 {
-	__asm__("bsfl %[Mask], %[Index]" : [Index] "=r" (*Index) : [Mask] "mr" (Mask));
+	__asm__("bsfl %k[Mask], %k[Index]" : [Index] "=r" (*Index) : [Mask] "mr" (Mask));
 	return Mask ? 1 : 0;
 }
 
diff --git a/plugins/GSdx/stdafx.h b/plugins/GSdx/stdafx.h
index a213f88633..78c7dfd49a 100644
--- a/plugins/GSdx/stdafx.h
+++ b/plugins/GSdx/stdafx.h
@@ -374,7 +374,7 @@ struct aligned_free_second {template<class T> void operator()(T& p) {_aligned_fr
 
 	__forceinline unsigned char _BitScanForward(unsigned long* const Index, const unsigned long Mask)
 	{
-		__asm__("bsfl %[Mask], %[Index]" : [Index] "=r" (*Index) : [Mask] "mr" (Mask));
+		__asm__("bsfl %k[Mask], %k[Index]" : [Index] "=r" (*Index) : [Mask] "mr" (Mask));
 		
 		return Mask ? 1 : 0;
 	}