diff --git a/package/ci/travis-emscripten.sh b/package/ci/travis-emscripten.sh
index 846341499..b2bde0356 100755
--- a/package/ci/travis-emscripten.sh
+++ b/package/ci/travis-emscripten.sh
@@ -42,8 +42,8 @@ cmake .. \
     -DCMAKE_TOOLCHAIN_FILE="../toolchains/generic/Emscripten.cmake" \
     -DEMSCRIPTEN_PREFIX=$(echo /usr/local/Cellar/emscripten/*/libexec) \
     -DCMAKE_BUILD_TYPE=Release \
-    -DCMAKE_CXX_FLAGS_RELEASE="-DNDEBUG -O1" \
-    -DCMAKE_EXE_LINKER_FLAGS_RELEASE="-O1" \
+    -DCMAKE_CXX_FLAGS_RELEASE="-DNDEBUG -O2" \
+    -DCMAKE_EXE_LINKER_FLAGS_RELEASE="-O2" \
     -DCMAKE_INSTALL_PREFIX=$HOME/deps \
     -DCMAKE_FIND_ROOT_PATH=$HOME/deps \
     -DWITH_AUDIO=ON \