1 files changed, 1 insertions, 1 deletions
diff --git a/build.sh b/build.sh
index 4aab5c0..f5c1722 100755
--- a/build.sh
+++ b/build.sh
@@ -18,7 +18,7 @@ CMAKE_DEFAULT_FLAGS=" $CMAKE_DEFAULT_FLAGS -DCMAKE_BUILD_TYPE=Release -DCMAKE_PR
 mkdir -p lib/prefix/include lib/prefix/lib
 if [[ "$@" != *"-lz"* ]]; then
   [ ! -e "lib/zlib" ] && echo "Make sure you've cloned submodules. (git submodule update --init --depth=1)" && exit -1
-  [[ ! -e "lib/zlib/build" && $OSTYPE != 'msys'* ]] && cd lib/zlib && mkdir build && cd build && $CC -D_LARGEFILE64_SOURCE -I.. ../*.c -c && ar rc libz.a *.o && cp libz.a ../../prefix/lib && cp ../*.h ../../prefix/include && cd ../../../
+  [[ ! -e "lib/zlib/build" && $OSTYPE != 'msys'* ]] && cd lib/zlib && mkdir build && cd build && $CC -O3 -D_LARGEFILE64_SOURCE -I.. ../*.c -c && ar rc libz.a *.o && cp libz.a ../../prefix/lib && cp ../*.h ../../prefix/include && cd ../../../
   LDFLAGS="$LDFLAGS -lz"
 fi
 if [[ "$@" != *"-lmbedtls"* && "$@" != *"-lmbedcrypto"* ]]; then