diff --git a/src/ruby/ext/grpc/rb_event_thread.c b/src/ruby/ext/grpc/rb_event_thread.c
index 014dd2dcd8882..b281e32beb91f 100644
--- a/src/ruby/ext/grpc/rb_event_thread.c
+++ b/src/ruby/ext/grpc/rb_event_thread.c
@@ -36,6 +36,7 @@ typedef struct grpc_rb_event {
   void* argument;
 
   struct grpc_rb_event* next;
+  static pid_t pid;
 } grpc_rb_event;
 
 typedef struct grpc_rb_event_queue {
@@ -57,6 +58,7 @@ void grpc_rb_event_queue_enqueue(void (*callback)(void*), void* argument) {
   grpc_rb_event* event = gpr_malloc(sizeof(grpc_rb_event));
   event->callback = callback;
   event->argument = argument;
+  event->pid = getpid();
   event->next = NULL;
   gpr_mu_lock(&event_queue.mu);
   if (event_queue.tail == NULL) {
@@ -81,6 +83,10 @@ static grpc_rb_event* grpc_rb_event_queue_dequeue() {
       event_queue.head = event_queue.head->next;
     }
   }
+  if (event->pid != getpid()) {
+    fprintf(stderr, "DEQUEUED EVENT PID %d != CURRENT PID %d\n", event->pid,
+            getpid());
+  }
   return event;
 }