diff --git a/os/hal/platforms/LPC11xx/pal_lld.h b/os/hal/platforms/LPC11xx/pal_lld.h
index d1a711868..f1f223b3b 100644
--- a/os/hal/platforms/LPC11xx/pal_lld.h
+++ b/os/hal/platforms/LPC11xx/pal_lld.h
@@ -268,7 +268,7 @@ typedef LPC_GPIO_TypeDef *ioportid_t;
  * @notapi
  */
 #define pal_lld_writepad(port, pad, bit)                                    \
-  ((port)->MASKED_ACCESS[(mask) << (pad)] = (bit) << (pad))
+  ((port)->MASKED_ACCESS[1 << (pad)] = (bit) << (pad))
 
 /**
  * @brief   Sets a pad logical state to @p PAL_HIGH.
diff --git a/os/hal/platforms/LPC13xx/pal_lld.h b/os/hal/platforms/LPC13xx/pal_lld.h
index 3b64a0c38..7ddd604d8 100644
--- a/os/hal/platforms/LPC13xx/pal_lld.h
+++ b/os/hal/platforms/LPC13xx/pal_lld.h
@@ -268,7 +268,7 @@ typedef LPC_GPIO_TypeDef *ioportid_t;
  * @notapi
  */
 #define pal_lld_writepad(port, pad, bit)                                    \
-  ((port)->MASKED_ACCESS[(mask) << (pad)] = (bit) << (pad))
+  ((port)->MASKED_ACCESS[1 << (pad)] = (bit) << (pad))
 
 /**
  * @brief   Sets a pad logical state to @p PAL_HIGH.
diff --git a/readme.txt b/readme.txt
index 507be741f..9d1020c99 100644
--- a/readme.txt
+++ b/readme.txt
@@ -82,6 +82,8 @@
 *****************************************************************************
 
 *** 2.5.1 ***
+- FIX: Fixed error in palWritePad() macro (bug 3586230)(backported to 2.2.10
+  and 2.4.3).
 - FIX: Fixed missing ; in testmbox.c (bug 3585979)(backported to 2.4.3).
 - FIX: Fixed STM32F4xx: Wrong CAN1 SCE interrupt number definition (bug
   3581571).