diff --git a/common.sh b/common.sh
index 2b3e3e2..84a36d0 100644
--- a/common.sh
+++ b/common.sh
@@ -2,5 +2,5 @@ GAME_ID=2006
 PROJECT_NAME=masterserver${GAME_ID}
 SRC_EXE_NAME=masterserver${GAME_ID}
 SOURCE_PATH=third_party/masterserver/server/masterserver
-COMPILE_FLAGS="-DGAME_ID=${GAME_ID} ."
+COMPILE_FLAGS="-DGAME_ID=${GAME_ID} -DLIB_DIR=ubuntu20.04_g++-9 ."
 PRE_COMPILE_CMD=""