diff --git a/core/libs/tests/GuestAmpr.cpp b/core/libs/tests/GuestAmpr.cpp
index b1087ad03..c36095250 100644
--- a/core/libs/tests/GuestAmpr.cpp
+++ b/core/libs/tests/GuestAmpr.cpp
@@ -557,8 +557,8 @@ constexpr std::int32_t cpuReadWrite = 0x03;
 constexpr std::int32_t cpuGpuReadWrite = 0x33;
 constexpr std::int32_t amprReadWrite = 0xC0;
 
-std::uint64_t& At(std::uint64_t address) {
-    return *reinterpret_cast<std::uint64_t*>(address);
+volatile std::uint64_t& At(std::uint64_t address) {
+    return *reinterpret_cast<volatile std::uint64_t*>(address);
 }
 
 void TestAmm() {