diff --git a/livekit-ffi/build.rs b/livekit-ffi/build.rs
index 0a68f58..0f83301 100644
--- a/livekit-ffi/build.rs
+++ b/livekit-ffi/build.rs
@@ -1,7 +1,9 @@
 use std::io::Result;
 
 fn main() -> Result<()> {
-    prost_build::compile_protos(
+    let mut prost_build = prost_build::Config::new();
+    prost_build.protoc_arg("--experimental_allow_proto3_optional");
+    prost_build.compile_protos(
         &[
             "protocol/ffi.proto",
             "protocol/handle.proto",
diff --git a/livekit-protocol/build.rs b/livekit-protocol/build.rs
index 52e91ab..307ee2b 100644
--- a/livekit-protocol/build.rs
+++ b/livekit-protocol/build.rs
@@ -2,6 +2,7 @@ use std::io::Result;
 
 fn main() -> Result<()> {
     let mut prost_build = prost_build::Config::new();
+    prost_build.protoc_arg("--experimental_allow_proto3_optional");
     prost_build.compile_protos(
         &[
             "protocol/livekit_egress.proto",