diff --git a/kernel/x86_64/saxpy_microk_haswell-2.c b/kernel/x86_64/saxpy_microk_haswell-2.c
index 3a743d64c..3b03e11a4 100644
--- a/kernel/x86_64/saxpy_microk_haswell-2.c
+++ b/kernel/x86_64/saxpy_microk_haswell-2.c
@@ -61,8 +61,8 @@ static void saxpy_kernel_16( BLASLONG n, FLOAT *x, FLOAT *y, FLOAT *alpha)
 
 	:
         : 
-          "r" (i),	// 0	
-	  "r" (n),  	// 1
+          "+r" (i),	// 0	
+	  "+r" (n),  	// 1
           "r" (x),      // 2
           "r" (y),      // 3
           "r" (alpha)   // 4