--- src/ruby/ext/grpc/rb_channel.c.orig	2023-05-20 19:48:13 UTC
+++ src/ruby/ext/grpc/rb_channel.c
@@ -694,7 +694,7 @@ static void run_poll_channels_loop_unblocking_func(voi
 }
 
 // Poll channel connectivity states in background thread without the GIL.
-static VALUE run_poll_channels_loop(VALUE arg) {
+static VALUE run_poll_channels_loop(void *arg) {
   (void)arg;
   gpr_log(
       GPR_DEBUG,
--- src/ruby/ext/grpc/rb_event_thread.c.orig	2023-05-20 19:51:52 UTC
+++ src/ruby/ext/grpc/rb_event_thread.c
@@ -114,7 +114,7 @@ static void grpc_rb_event_unblocking_func(void* arg) {
 
 /* This is the implementation of the thread that handles auth metadata plugin
  * events */
-static VALUE grpc_rb_event_thread(VALUE arg) {
+static VALUE grpc_rb_event_thread(void *arg) {
   grpc_rb_event* event;
   (void)arg;
   grpc_ruby_init();