diff --git a/core/iwasm/libraries/libc-builtin/libc_builtin_wrapper.c b/core/iwasm/libraries/libc-builtin/libc_builtin_wrapper.c
index 8db888fe..a68c0749 100644
--- a/core/iwasm/libraries/libc-builtin/libc_builtin_wrapper.c
+++ b/core/iwasm/libraries/libc-builtin/libc_builtin_wrapper.c
@@ -16,7 +16,7 @@
 void
 wasm_runtime_set_exception(wasm_module_inst_t module, const char *exception);
 
-uint32
+uint64
 wasm_runtime_module_realloc(wasm_module_inst_t module, uint64 ptr, uint64 size,
                             void **p_native_addr);
 
@@ -683,9 +683,12 @@ calloc_wrapper(wasm_exec_env_t exec_env, uint32 nmemb, uint32 size)
 static uint32
 realloc_wrapper(wasm_exec_env_t exec_env, uint32 ptr, uint32 new_size)
 {
+    uint64 ret_offset = 0;
     wasm_module_inst_t module_inst = get_module_inst(exec_env);
 
-    return wasm_runtime_module_realloc(module_inst, ptr, new_size, NULL);
+    ret_offset = wasm_runtime_module_realloc(module_inst, ptr, new_size, NULL);
+    bh_assert(ret_offset < UINT32_MAX);
+    return (uint32)ret_offset;
 }
 
 static void