diff --git a/samples/custom_default_heap/CMakeLists.txt b/samples/custom_default_heap/CMakeLists.txt
new file mode 100644
index 00000000..9202bbf7
--- /dev/null
+++ b/samples/custom_default_heap/CMakeLists.txt
@@ -0,0 +1,20 @@
+cmake_minimum_required(VERSION 3.2)
+project(custom_default_heap C)
+include("${WUT_ROOT}/share/wut.cmake" REQUIRED)
+
+add_executable(custom_default_heap
+   main.c)
+
+target_link_libraries(custom_default_heap
+   whb
+   proc_ui
+   sysapp)
+
+wut_add_exports(custom_default_heap
+   exports.def)
+
+wut_create_rpx(custom_default_heap.rpx
+               custom_default_heap)
+
+install(FILES "${CMAKE_CURRENT_BINARY_DIR}/custom_default_heap.rpl"
+        DESTINATION "${CMAKE_INSTALL_PREFIX}")
diff --git a/samples/custom_default_heap/exports.def b/samples/custom_default_heap/exports.def
new file mode 100644
index 00000000..00f80fa1
--- /dev/null
+++ b/samples/custom_default_heap/exports.def
@@ -0,0 +1,2 @@
+:TEXT
+__preinit_user
diff --git a/samples/custom_default_heap/main.c b/samples/custom_default_heap/main.c
new file mode 100644
index 00000000..6761752c
--- /dev/null
+++ b/samples/custom_default_heap/main.c
@@ -0,0 +1,128 @@
+#include <coreinit/dynload.h>
+#include <coreinit/memheap.h>
+#include <coreinit/memdefaultheap.h>
+#include <coreinit/memexpheap.h>
+#include <coreinit/memfrmheap.h>
+#include <coreinit/memory.h>
+#include <coreinit/time.h>
+#include <coreinit/systeminfo.h>
+
+#include <whb/proc.h>
+#include <whb/log.h>
+#include <whb/log_console.h>
+
+static MEMHeapHandle sCustomHeap = NULL;
+static uint32_t sCustomHeapAddr = 0;
+static uint32_t sCustomHeapSize = 0;
+
+static void *
+CustomAllocFromDefaultHeap(uint32_t size)
+{
+   return MEMAllocFromExpHeapEx(sCustomHeap, size, 4);
+}
+
+static void *
+CustomAllocFromDefaultHeapEx(uint32_t size,
+                             int32_t alignment)
+{
+   return MEMAllocFromExpHeapEx(sCustomHeap, size, alignment);
+}
+
+static void
+CustomFreeToDefaultHeap(void* ptr)
+{
+   MEMFreeToExpHeap(sCustomHeap, ptr);
+}
+
+static OSDynLoad_Error
+CustomDynLoadAlloc(int32_t size,
+                   int32_t align,
+                   void **outAddr)
+{
+   if (!outAddr) {
+      return OS_DYNLOAD_INVALID_ALLOCATOR_PTR;
+   }
+
+   if (align >= 0 && align < 4) {
+      align = 4;
+   } else if (align < 0 && align > -4) {
+      align = -4;
+   }
+
+   if (!(*outAddr = MEMAllocFromDefaultHeapEx(size, align))) {
+      return OS_DYNLOAD_OUT_OF_MEMORY;
+   }
+
+   return OS_DYNLOAD_OK;
+}
+
+static void
+CustomDynLoadFree(void *addr)
+{
+   MEMFreeToDefaultHeap(addr);
+}
+
+void
+__preinit_user(MEMHeapHandle *mem1,
+               MEMHeapHandle *foreground,
+               MEMHeapHandle *mem2)
+{
+   uint32_t addr, size;
+
+   MEMAllocFromDefaultHeap = CustomAllocFromDefaultHeap;
+   MEMAllocFromDefaultHeapEx = CustomAllocFromDefaultHeapEx;
+   MEMFreeToDefaultHeap = CustomFreeToDefaultHeap;
+
+   if (OSGetForegroundBucket(NULL, NULL)) {
+      OSGetMemBound(OS_MEM1, &addr, &size);
+      *mem1 = MEMCreateFrmHeapEx((void *)addr, size, 0);
+
+      OSGetForegroundBucketFreeArea(&addr, &size);
+      *foreground = MEMCreateFrmHeapEx((void *)addr, size, 0);
+   }
+
+   OSGetMemBound(OS_MEM2, &addr, &size);
+   sCustomHeap = MEMCreateExpHeapEx((void *)addr, size, MEM_HEAP_FLAG_USE_LOCK);
+   sCustomHeapAddr = addr;
+   sCustomHeapSize = size;
+   *mem2 = sCustomHeap;
+
+   OSDynLoad_SetAllocator(CustomDynLoadAlloc, CustomDynLoadFree);
+   OSDynLoad_SetTLSAllocator(CustomDynLoadAlloc, CustomDynLoadFree);
+}
+
+
+void
+heapBlockVisitor(void *block,
+                 MEMHeapHandle heap,
+                 void *context)
+{
+   WHBLogPrintf("Block 0x%08X, size 0x%08X, group 0x%04X, direction %d",
+                (uint32_t)block,
+                MEMGetSizeForMBlockExpHeap(block),
+                MEMGetGroupIDForMBlockExpHeap(block),
+                MEMGetAllocDirForMBlockExpHeap(block));
+}
+
+int
+main(int argc, char **argv)
+{
+   WHBProcInit();
+   WHBLogConsoleInit();
+   WHBLogPrintf("sCustomHeapAddr = 0x%08X", sCustomHeapAddr);
+   WHBLogPrintf("sCustomHeapSize = 0x%08X", sCustomHeapSize);
+
+   WHBLogPrintf("MEMGetTotalFreeSizeForExpHeap = 0x%08X", MEMGetTotalFreeSizeForExpHeap(sCustomHeap));
+   WHBLogPrintf("MEMGetAllocatableSizeForExpHeapEx = 0x%08X", MEMGetAllocatableSizeForExpHeapEx(sCustomHeap, 4));
+
+   MEMVisitAllocatedForExpHeap(sCustomHeap, heapBlockVisitor, NULL);
+
+   while(WHBProcIsRunning()) {
+      WHBLogConsoleDraw();
+      OSSleepTicks(OSMillisecondsToTicks(100));
+   }
+
+   WHBLogConsoleFree();
+   WHBProcShutdown();
+   return 0;
+}