diff --git a/astra-sim-alibabacloud/build/astra_ns3/build.sh b/astra-sim-alibabacloud/build/astra_ns3/build.sh
index a8013812..457de9b6 100755
--- a/astra-sim-alibabacloud/build/astra_ns3/build.sh
+++ b/astra-sim-alibabacloud/build/astra_ns3/build.sh
@@ -53,7 +53,7 @@ function compile {
     cp -r "${ASTRA_SIM_DIR}" "${NS3_APPLICATION}"/
     cd "${NS3_DIR}/simulation"
     CC='gcc' CXX='g++' 
-    ./ns3 configure -d debug --enable-mtp
+    ./ns3 configure -d optimized --enable-mtp -- -DCMAKE_CXX_FLAGS="-g -O2"
     ./ns3 build
 
     cd "${SCRIPT_DIR:?}"