diff --git a/libraries/AP_HAL_ESP32/Util.cpp b/libraries/AP_HAL_ESP32/Util.cpp
index d232ff8907..2eab971532 100644
--- a/libraries/AP_HAL_ESP32/Util.cpp
+++ b/libraries/AP_HAL_ESP32/Util.cpp
@@ -90,7 +90,7 @@ void Util::free_type(void *ptr, size_t size, AP_HAL::Util::Memory_Type mem_type)
 }
 
 
-#ifdef ENABLE_HEAP
+#if ENABLE_HEAP
 
 void *Util::allocate_heap_memory(size_t size)
 {
diff --git a/libraries/AP_HAL_ESP32/Util.h b/libraries/AP_HAL_ESP32/Util.h
index fcf83ec3b6..8e9ba9dc94 100644
--- a/libraries/AP_HAL_ESP32/Util.h
+++ b/libraries/AP_HAL_ESP32/Util.h
@@ -34,7 +34,7 @@ public:
     void *malloc_type(size_t size, AP_HAL::Util::Memory_Type mem_type) override;
     void free_type(void *ptr, size_t size, AP_HAL::Util::Memory_Type mem_type) override;
 
-#ifdef ENABLE_HEAP
+#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;
@@ -85,7 +85,7 @@ private:
     FlashBootloader flash_bootloader() override;
 #endif
 
-#ifdef ENABLE_HEAP
+#if ENABLE_HEAP
     // static memory_heap_t scripting_heap;
 #endif // ENABLE_HEAP