diff --git a/kernel/x86_64/sdot_microk_haswell-2.c b/kernel/x86_64/sdot_microk_haswell-2.c
index df367b61f..89d9cfe61 100644
--- a/kernel/x86_64/sdot_microk_haswell-2.c
+++ b/kernel/x86_64/sdot_microk_haswell-2.c
@@ -81,8 +81,8 @@ static void sdot_kernel_16( BLASLONG n, FLOAT *x, FLOAT *y, FLOAT *dot)
 
 	:
         : 
-          "r" (i),	// 0	
-	  "r" (n),  	// 1
+          "+r" (i),	// 0	
+	  "+r" (n),  	// 1
           "r" (x),      // 2
           "r" (y),      // 3
           "r" (dot)     // 4