diff --git a/arch/arm/src/common/arm_allocateheap.c b/arch/arm/src/common/arm_allocateheap.c
index 83b878423a..4d571fc3a0 100644
--- a/arch/arm/src/common/arm_allocateheap.c
+++ b/arch/arm/src/common/arm_allocateheap.c
@@ -105,7 +105,7 @@
 #ifdef CONFIG_BUILD_KERNEL
 void up_allocate_kheap(void **heap_start, size_t *heap_size)
 #else
-void up_allocate_heap(void **heap_start, size_t *heap_size)
+void weak_function up_allocate_heap(void **heap_start, size_t *heap_size)
 #endif
 {
 #if defined(CONFIG_BUILD_PROTECTED) && defined(CONFIG_MM_KERNEL_HEAP)