diff --git a/hal/hw_reg_access.S b/hal/hw_reg_access.S
index 41c7bbf..f2e1447 100644
--- a/hal/hw_reg_access.S
+++ b/hal/hw_reg_access.S
@@ -171,7 +171,7 @@ HW_set_8bit_reg:
  * @return          8 bits value read from the peripheral register.
  */
 HW_get_8bit_reg:
-    lb a0, 0(a0)
+    lbu a0, 0(a0)
     ret
 
 /***************************************************************************//**