diff --git a/src/core/mem/arena/mem_arena.c b/src/core/mem/arena/mem_arena.c
index 9129c97..fd6eb8d 100644
--- a/src/core/mem/arena/mem_arena.c
+++ b/src/core/mem/arena/mem_arena.c
@@ -95,6 +95,14 @@ void *wapp_mem_arena_alloc_aligned(Arena *arena, u64 size, u64 alignment) {
   return (void *)output;
 }
 
+void *wapp_mem_arena_realloc(Arena *arena, void *ptr, u64 old_size, u64 new_size) {
+  return NULL;
+}
+
+void *wapp_mem_arena_realloc_aligned(Arena *arena, void *ptr, u64 old_size, u64 new_size, u64 alignment) {
+  return NULL;
+}
+
 void wapp_mem_arena_clear(Arena *arena) {
   if (!arena) {
     return;
diff --git a/src/core/mem/arena/mem_arena.h b/src/core/mem/arena/mem_arena.h
index f4fddff..1eca49c 100644
--- a/src/core/mem/arena/mem_arena.h
+++ b/src/core/mem/arena/mem_arena.h
@@ -47,6 +47,8 @@ bool wapp_mem_arena_init_custom(Arena **arena, u64 base_capacity,
                                 MemAllocFlags flags, bool zero_buffer);
 void *wapp_mem_arena_alloc(Arena *arena, u64 size);
 void *wapp_mem_arena_alloc_aligned(Arena *arena, u64 size, u64 alignment);
+void *wapp_mem_arena_realloc(Arena *arena, void *ptr, u64 old_size, u64 new_size);
+void *wapp_mem_arena_realloc_aligned(Arena *arena, void *ptr, u64 old_size, u64 new_size, u64 alignment);
 void wapp_mem_arena_clear(Arena *arena);
 void wapp_mem_arena_destroy(Arena **arena);
 
diff --git a/src/core/mem/arena/mem_arena_allocator.c b/src/core/mem/arena/mem_arena_allocator.c
index da0829c..2aee280 100644
--- a/src/core/mem/arena/mem_arena_allocator.c
+++ b/src/core/mem/arena/mem_arena_allocator.c
@@ -8,8 +8,10 @@
 /***************************************************************************/ //
 
 internal inline void *mem_arena_alloc(u64 size, void *alloc_obj);
-internal inline void *mem_arena_alloc_aligned(u64 size, u64 alignment,
-                                              void *alloc_obj);
+internal inline void *mem_arena_alloc_aligned(u64 size, u64 alignment, void *alloc_obj);
+internal inline void *mem_arena_realloc(void *ptr, u64 old_size, u64 new_size, void *alloc_obj);
+internal inline void *mem_arena_realloc_aligned(void *ptr, u64 old_size, u64 new_size, u64 alignment,
+                                                void *alloc_obj);
 
 /***************************************************************************/ //
 ////////////////////////////////////////////////////////////////////////////////
@@ -29,6 +31,8 @@ Allocator wapp_mem_arena_allocator_init_custom(u64 base_capacity,
 
   allocator.alloc = mem_arena_alloc;
   allocator.alloc_aligned = mem_arena_alloc_aligned;
+  allocator.realloc = mem_arena_realloc;
+  allocator.realloc_aligned = mem_arena_realloc_aligned;
 
   return allocator;
 }
@@ -58,3 +62,14 @@ internal inline void *mem_arena_alloc_aligned(u64 size, u64 alignment,
   Arena *arena = (Arena *)alloc_obj;
   return wapp_mem_arena_alloc_aligned(arena, size, alignment);
 }
+
+internal inline void *mem_arena_realloc(void *ptr, u64 old_size, u64 new_size, void *alloc_obj) {
+  Arena *arena = (Arena *)alloc_obj;
+  return wapp_mem_arena_realloc(arena, ptr, old_size, new_size);
+}
+
+internal inline void *mem_arena_realloc_aligned(void *ptr, u64 old_size, u64 new_size, u64 alignment,
+                                                void *alloc_obj) {
+  Arena *arena = (Arena *)alloc_obj;
+  return wapp_mem_arena_realloc_aligned(arena, ptr, old_size, new_size, alignment);
+}
diff --git a/src/core/mem/arena/mem_arena_allocator.h b/src/core/mem/arena/mem_arena_allocator.h
index 9b738e3..bd77b6d 100644
--- a/src/core/mem/arena/mem_arena_allocator.h
+++ b/src/core/mem/arena/mem_arena_allocator.h
@@ -46,9 +46,7 @@ extern "C" {
  * The `wapp_mem_arena_allocator_init_custom` provides the most control over how
  * the Arena is initialised. Wrapper macros are provided for easier use.
  */
-Allocator wapp_mem_arena_allocator_init_custom(u64 base_capacity,
-                                               MemAllocFlags flags,
-                                               bool zero_buffer);
+Allocator wapp_mem_arena_allocator_init_custom(u64 base_capacity, MemAllocFlags flags, bool zero_buffer);
 void wapp_mem_arena_allocator_clear(Allocator *allocator);
 void wapp_mem_arena_allocator_destroy(Allocator *allocator);