diff --git a/libraries/AP_HAL_ESP32/Util.cpp b/libraries/AP_HAL_ESP32/Util.cpp
index 8585e23fc8..97375b6235 100644
--- a/libraries/AP_HAL_ESP32/Util.cpp
+++ b/libraries/AP_HAL_ESP32/Util.cpp
@@ -93,35 +93,10 @@ void Util::free_type(void *ptr, size_t size, AP_HAL::Util::Memory_Type mem_type)
 
 #if ENABLE_HEAP
 
-void *Util::allocate_heap_memory(size_t size)
-{
-    void *buf = calloc(1, size);
-    if (buf == nullptr) {
-        return nullptr;
-    }
-
-    multi_heap_handle_t *heap = (multi_heap_handle_t *)calloc(1, sizeof(multi_heap_handle_t));
-    if (heap != nullptr) {
-        auto hp = multi_heap_register(buf, size);
-        memcpy(heap, &hp, sizeof(multi_heap_handle_t));
-    }
-
-    return heap;
-}
-
-void *Util::heap_realloc(void *heap, void *ptr, size_t old_size, size_t new_size)
-{
-    if (heap == nullptr) {
-        return nullptr;
-    }
-
-    return multi_heap_realloc(*(multi_heap_handle_t *)heap, ptr, new_size);
-}
-
 /*
   realloc implementation thanks to wolfssl, used by AP_Scripting
  */
-void *Util::std_realloc(void *addr, size_t size)
+void *Util::std_realloc(void *addr, uint32_t size)
 {
     if (size == 0) {
         free(addr);
diff --git a/libraries/AP_HAL_ESP32/Util.h b/libraries/AP_HAL_ESP32/Util.h
index 8e9ba9dc94..1e5a78bf09 100644
--- a/libraries/AP_HAL_ESP32/Util.h
+++ b/libraries/AP_HAL_ESP32/Util.h
@@ -36,9 +36,7 @@ public:
 
 #if ENABLE_HEAP
     // heap functions, note that a heap once alloc'd cannot be dealloc'd
-    virtual void *allocate_heap_memory(size_t size) override;
-    virtual void *heap_realloc(void *heap, void *ptr, size_t old_size, size_t new_size) override;
-    virtual void *std_realloc(void *ptr, size_t new_size) override;
+    virtual void *std_realloc(void *ptr, uint32_t new_size) override;
 #endif // ENABLE_HEAP
 
     /*
@@ -85,10 +83,6 @@ private:
     FlashBootloader flash_bootloader() override;
 #endif
 
-#if ENABLE_HEAP
-    // static memory_heap_t scripting_heap;
-#endif // ENABLE_HEAP
-
     // stm32F4 and F7 have 20 total RTC backup registers. We use the first one for boot type
     // flags, so 19 available for persistent data
     static_assert(sizeof(persistent_data) <= 19*4, "watchdog persistent data too large");