diff --git a/src/ruby/ext/grpc/rb_grpc.c b/src/ruby/ext/grpc/rb_grpc.c
index 699548b..ace8622 100644
--- a/src/ruby/ext/grpc/rb_grpc.c
+++ b/src/ruby/ext/grpc/rb_grpc.c
@@ -51,7 +51,8 @@
 
 static rb_data_type_t grpc_rb_timespec_data_type = {
     "gpr_timespec",
-    {GRPC_RB_GC_NOT_MARKED, GRPC_RB_GC_DONT_FREE, GRPC_RB_MEMSIZE_UNAVAILABLE},
+    {GRPC_RB_GC_NOT_MARKED, GRPC_RB_GC_DONT_FREE, GRPC_RB_MEMSIZE_UNAVAILABLE,
+     {NULL, NULL}},
     NULL,
     NULL,
     RUBY_TYPED_FREE_IMMEDIATELY};
@@ -75,6 +76,7 @@
 
 /* Init/Clone func that fails by raising an exception. */
 VALUE grpc_rb_cannot_init_copy(VALUE copy, VALUE self) {
+  (void)self;
   rb_raise(rb_eTypeError,
            "initialization of %s only allowed from the gRPC native layer",
            rb_obj_classname(copy));
@@ -250,7 +252,10 @@
   id_tv_nsec = rb_intern("tv_nsec");
 }
 
-static void grpc_rb_shutdown(ruby_vm_t *vm) { grpc_shutdown(); }
+static void grpc_rb_shutdown(ruby_vm_t *vm) {
+  (void)vm;
+  grpc_shutdown();
+}
 
 /* Initialize the GRPC module structs */