diff --git a/tools/pynuttx/nxgdb/mm.py b/tools/pynuttx/nxgdb/mm.py
index dbb1e56dec6..6a851613412 100644
--- a/tools/pynuttx/nxgdb/mm.py
+++ b/tools/pynuttx/nxgdb/mm.py
@@ -374,7 +374,7 @@ class MMNode(gdb.Value, p.MMFreeNode):
     MM_MASK_BIT = MM_ALLOC_BIT | MM_PREVFREE_BIT
     MM_SIZEOF_ALLOCNODE = utils.sizeof("struct mm_allocnode_s")
     MM_ALLOCNODE_OVERHEAD = MM_SIZEOF_ALLOCNODE - utils.sizeof("mmsize_t")
-    MM_MIN_CHUNK = utils.get_symbol_value("MM_MIN_CHUNK", locspec="mm_initialize")
+    MM_MIN_CHUNK = utils.get_symbol_value("MM_MIN_CHUNK", locspec="mm_initialize_heap")
 
     def __init__(self, node: gdb.Value):
         if node.type.code == gdb.TYPE_CODE_PTR: