diff --git a/example/web/build-tdlib.sh b/example/web/build-tdlib.sh
index 26587bf0..548c77e3 100755
--- a/example/web/build-tdlib.sh
+++ b/example/web/build-tdlib.sh
@@ -29,11 +29,11 @@ cmake $TD_ROOT || exit 1
 cd ../..
 
 cd build/wasm
-eval emconfigure cmake $TD_ROOT $OPENSSL_OPTIONS || exit 1
+eval emconfigure cmake -DCMAKE_BUILD_TYPE=Release $OPENSSL_OPTIONS $TD_ROOT || exit 1
 cd ../..
 
 cd build/asmjs
-eval emconfigure cmake $TD_ROOT $OPENSSL_OPTIONS -DASMJS=1 || exit 1
+eval emconfigure cmake -DCMAKE_BUILD_TYPE=Release $OPENSSL_OPTIONS -DASMJS=1 $TD_ROOT || exit 1
 cd ../..
 
 echo "Generating TDLib autogenerated source files..."