diff --git a/scripts/build.sh b/scripts/build.sh
index 96bf302..90403fc 100755
--- a/scripts/build.sh
+++ b/scripts/build.sh
@@ -26,7 +26,7 @@ mkdir build
 cd build || exit
 make clean
 cmake .. -DCMAKE_BUILD_TYPE=Release -DSVT_AV1_LTO=ON -DNATIVE=ON \
-          -DCMAKE_C_FLAGS="-flto -O3 -mcpu=native" || exit
+          -DCMAKE_C_FLAGS="-flto -O2 -mcpu=native" || exit
 make -j "$(nproc)" || exit
 sudo make install || exit
 
@@ -50,7 +50,7 @@ git pull
 mkdir build
 cd build || exit
 cmake .. -DCMAKE_BUILD_TYPE=Release -DBUILD_SHARED_LIBS=ON\
-          -DCMAKE_C_FLAGS="-flto -O3 -mcpu=native" || exit
+          -DCMAKE_C_FLAGS="-flto -O2 -mcpu=native" || exit
 make -j "$(nproc)" || exit
 sudo make install || exit