diff --git a/PKGBUILD b/PKGBUILD
index 25a48a0..0ae463a 100644
--- a/PKGBUILD
+++ b/PKGBUILD
@@ -9,14 +9,20 @@ arch=('x86_64')
 url='https://github.com/mitmproxy/mitmproxy_rs'
 license=('MIT')
 depends=('python')
-makedepends=('maturin' 'python-installer' 'cargo')
+makedepends=('maturin' 'python-installer' 'cargo' 'protobuf')
 options=(!lto)
 source=("https://github.com/mitmproxy/mitmproxy_rs/archive/$pkgver/$pkgname-$pkgver.tar.gz")
 sha512sums=('cf6fdd9419fe4e404c8db796b2d5bb1225d79e6c2d3a40876fed4496ff9c1952aec19a17d1924537d8611e845f029a98582a03d983ffeb46cb9e39df2718102c')
 
+
+prepare() {
+  cd ${_pyname}-${pkgver}/mitmproxy-rs
+  cargo fetch --locked
+}
+
 build() {
   cd ${_pyname}-${pkgver}/mitmproxy-rs
-  maturin build --release --strip
+  PROTOC=/usr/bin/protoc maturin build --frozen --release --strip
 }
 
 check() {