diff --git a/src/system/kernel/heap.cpp b/src/system/kernel/heap.cpp
index d2cebeb0c6..90773e5514 100644
--- a/src/system/kernel/heap.cpp
+++ b/src/system/kernel/heap.cpp
@@ -148,7 +148,7 @@ typedef SinglyLinkedList<DeferredDeletable> DeferredDeletableList;
 
 // Heap class configuration
 #define HEAP_CLASS_COUNT 3
-static heap_class sHeapClasses[HEAP_CLASS_COUNT] = {
+static const heap_class sHeapClasses[HEAP_CLASS_COUNT] = {
 	{
 		"small",					/* name */
 		50,							/* initial percentage */
diff --git a/src/system/libroot/posix/malloc_debug/heap.cpp b/src/system/libroot/posix/malloc_debug/heap.cpp
index 05aed47b6b..2dc4d90126 100644
--- a/src/system/libroot/posix/malloc_debug/heap.cpp
+++ b/src/system/libroot/posix/malloc_debug/heap.cpp
@@ -154,7 +154,7 @@ typedef struct heap_class_s {
 
 // Heap class configuration
 #define HEAP_CLASS_COUNT 3
-static heap_class sHeapClasses[HEAP_CLASS_COUNT] = {
+static const heap_class sHeapClasses[HEAP_CLASS_COUNT] = {
 	{
 		"small",					/* name */
 		50,							/* initial percentage */