diff --git a/server/wsproxy/CMakeLists.txt b/server/wsproxy/CMakeLists.txt
index d89afe5..45af09f 100644
--- a/server/wsproxy/CMakeLists.txt
+++ b/server/wsproxy/CMakeLists.txt
@@ -18,12 +18,12 @@ else()
   message("debug mode")
 endif()
 
-set(CMAKE_CXX_FLAGS_RELEASE "-O3 -Wall -g -std=gnu++1z -DGAME_ID=${GAME_ID} -DNDEBUG")
+set(CMAKE_CXX_FLAGS_RELEASE "-O3 -Wall -g -std=gnu++1z -DGAME_ID=${GAME_ID} -DMMCHK=1 -DNDEBUG")
 if (${ASAN})
-  set(CMAKE_CXX_FLAGS_DEBUG "-Wall -g -std=gnu++1z -DGAME_ID=${GAME_ID} -DDEBUG -fsanitize=address -fno-omit-frame-pointer -fsanitize-recover=address")
+  set(CMAKE_CXX_FLAGS_DEBUG "-Wall -g -std=gnu++1z -DGAME_ID=${GAME_ID} -DMMCHK=1 -DDEBUG -fsanitize=address -fno-omit-frame-pointer -fsanitize-recover=address")
     message("asan mode")
 else()
-  set(CMAKE_CXX_FLAGS_DEBUG "-Wall -g -std=gnu++1z -DGAME_ID=${GAME_ID} -DDEBUG -fsanitize-recover=address")
+  set(CMAKE_CXX_FLAGS_DEBUG "-Wall -g -std=gnu++1z -DGAME_ID=${GAME_ID} -DMMCHK=1 -DDEBUG -fsanitize-recover=address")
 endif()
 
 include_directories(
diff --git a/third_party/a8 b/third_party/a8
index 380074e..c99c33e 160000
--- a/third_party/a8
+++ b/third_party/a8
@@ -1 +1 @@
-Subproject commit 380074e2f78043a71b134c420af20b00127b1967
+Subproject commit c99c33e2e97058bd812dc4d9d931b94757d280bd