diff --git a/.github/lexicon.txt b/.github/lexicon.txt
index 3263b0843..718b0b37e 100644
--- a/.github/lexicon.txt
+++ b/.github/lexicon.txt
@@ -2476,6 +2476,7 @@ vapplicationgetidletaskmemory
 vapplicationgettimertaskmemory
 vapplicationidlehook
 vapplicationirqhandler
+vapplicationmallocfailedhook
 vapplicationsetuptickinterrupt
 vapplicationsetupticktimerinterrupt
 vapplicationsetuptimerinterrupt
diff --git a/include/portable.h b/include/portable.h
index 0feedad68..d0c3b9083 100644
--- a/include/portable.h
+++ b/include/portable.h
@@ -188,6 +188,19 @@ size_t xPortGetMinimumEverFreeHeapSize( void ) PRIVILEGED_FUNCTION;
     #define vPortFreeStack       vPortFree
 #endif
 
+#if ( configUSE_MALLOC_FAILED_HOOK == 1 )
+
+/**
+ * task.h
+ * @code{c}
+ * void vApplicationMallocFailedHook( void )
+ * @endcode
+ *
+ * This hook function is called when allocation failed.
+ */
+    void vApplicationMallocFailedHook( void ); /*lint !e526 Symbol not defined as it is an application callback. */
+#endif
+
 /*
  * Setup the hardware ready for the scheduler to take control.  This generally
  * sets up a tick interrupt and sets timers for the correct tick frequency.
diff --git a/portable/MemMang/heap_1.c b/portable/MemMang/heap_1.c
index 67825f522..9c7c52315 100644
--- a/portable/MemMang/heap_1.c
+++ b/portable/MemMang/heap_1.c
@@ -118,7 +118,6 @@ void * pvPortMalloc( size_t xWantedSize )
     {
         if( pvReturn == NULL )
         {
-            extern void vApplicationMallocFailedHook( void );
             vApplicationMallocFailedHook();
         }
     }
diff --git a/portable/MemMang/heap_2.c b/portable/MemMang/heap_2.c
index 163a12edd..0700a0d7a 100644
--- a/portable/MemMang/heap_2.c
+++ b/portable/MemMang/heap_2.c
@@ -249,7 +249,6 @@ void * pvPortMalloc( size_t xWantedSize )
     {
         if( pvReturn == NULL )
         {
-            extern void vApplicationMallocFailedHook( void );
             vApplicationMallocFailedHook();
         }
     }
diff --git a/portable/MemMang/heap_3.c b/portable/MemMang/heap_3.c
index 6accd48c7..8ed3d1b4f 100644
--- a/portable/MemMang/heap_3.c
+++ b/portable/MemMang/heap_3.c
@@ -71,7 +71,6 @@ void * pvPortMalloc( size_t xWantedSize )
     {
         if( pvReturn == NULL )
         {
-            extern void vApplicationMallocFailedHook( void );
             vApplicationMallocFailedHook();
         }
     }
diff --git a/portable/MemMang/heap_4.c b/portable/MemMang/heap_4.c
index 33bb81838..90a20c54f 100644
--- a/portable/MemMang/heap_4.c
+++ b/portable/MemMang/heap_4.c
@@ -269,7 +269,6 @@ void * pvPortMalloc( size_t xWantedSize )
     {
         if( pvReturn == NULL )
         {
-            extern void vApplicationMallocFailedHook( void );
             vApplicationMallocFailedHook();
         }
         else
diff --git a/portable/MemMang/heap_5.c b/portable/MemMang/heap_5.c
index b33043986..4fea255b1 100644
--- a/portable/MemMang/heap_5.c
+++ b/portable/MemMang/heap_5.c
@@ -279,7 +279,6 @@ void * pvPortMalloc( size_t xWantedSize )
     {
         if( pvReturn == NULL )
         {
-            extern void vApplicationMallocFailedHook( void );
             vApplicationMallocFailedHook();
         }
         else