diff --git a/xtoskrnl/ar/amd64/cpufunc.c b/xtoskrnl/ar/amd64/cpufunc.c
index 4336b38..8104b31 100644
--- a/xtoskrnl/ar/amd64/cpufunc.c
+++ b/xtoskrnl/ar/amd64/cpufunc.c
@@ -324,6 +324,7 @@ ArReadControlRegister(IN USHORT ControlRegister)
                          : "=r" (Value)
                          :
                          : "memory");
+            break;
         default:
             /* Invalid control register set */
             Value = 0;