diff --git a/Zend/zend_alloc.c b/Zend/zend_alloc.c
index e86f2961cfac9..b4db2f0b03cb7 100644
--- a/Zend/zend_alloc.c
+++ b/Zend/zend_alloc.c
@@ -2457,8 +2457,8 @@ ZEND_API bool is_zend_ptr(const void *ptr)
 
 	zend_mm_huge_list *block = AG(mm_heap)->huge_list;
 	while (block) {
-		if (ptr >= (void*)block
-				&& ptr < (void*)((char*)block + block->size)) {
+		if (ptr >= block->ptr
+				&& ptr < (void*)((char*)block->ptr + block->size)) {
 			return 1;
 		}
 		block = block->next;