diff --git a/runtime/bin/eventhandler_fuchsia.cc b/runtime/bin/eventhandler_fuchsia.cc
index 4d0804bec9e..16eee9d77ad 100644
--- a/runtime/bin/eventhandler_fuchsia.cc
+++ b/runtime/bin/eventhandler_fuchsia.cc
@@ -340,7 +340,7 @@ void EventHandlerImplementation::WakeupHandler(intptr_t id,
   msg->id = id;
   msg->dart_port = dart_port;
   msg->data = data;
-  zx_status_t status = zx_port_queue(port_handle_, &pkt, 1);
+  zx_status_t status = zx_port_queue(port_handle_, &pkt);
   if (status != ZX_OK) {
     // This is a FATAL because the VM won't work at all if we can't send any
     // messages to the EventHandler thread.
@@ -511,7 +511,7 @@ void EventHandlerImplementation::Poll(uword args) {
                                       millis == kInfinityTimeout
                                           ? ZX_TIME_INFINITE
                                           : zx_deadline_after(ZX_MSEC(millis)),
-                                      &pkt, 1);
+                                      &pkt);
     if (status == ZX_ERR_TIMED_OUT) {
       handler_impl->HandleTimeout();
     } else if (status != ZX_OK) {
diff --git a/runtime/bin/process_fuchsia.cc b/runtime/bin/process_fuchsia.cc
index 43f01cad6f6..d8ff3d0b720 100644
--- a/runtime/bin/process_fuchsia.cc
+++ b/runtime/bin/process_fuchsia.cc
@@ -205,7 +205,7 @@ class ExitCodeHandler {
   static void SendShutdownMessage() {
     zx_port_packet_t pkt;
     pkt.key = kShutdownPacketKey;
-    zx_status_t status = zx_port_queue(port_, &pkt, 1);
+    zx_status_t status = zx_port_queue(port_, &pkt);
     if (status != ZX_OK) {
       Log::PrintErr("ExitCodeHandler: zx_port_queue failed: %s\n",
                     zx_status_get_string(status));
@@ -219,7 +219,7 @@ class ExitCodeHandler {
 
     zx_port_packet_t pkt;
     while (true) {
-      zx_status_t status = zx_port_wait(port_, ZX_TIME_INFINITE, &pkt, 1);
+      zx_status_t status = zx_port_wait(port_, ZX_TIME_INFINITE, &pkt);
       if (status != ZX_OK) {
         FATAL1("ExitCodeHandler: zx_port_wait failed: %s\n",
                zx_status_get_string(status));
@@ -397,7 +397,7 @@ bool Process::Wait(intptr_t pid,
   }
   while ((out_tmp != NULL) || (err_tmp != NULL) || (exit_tmp != NULL)) {
     zx_port_packet_t pkt;
-    status = zx_port_wait(port, ZX_TIME_INFINITE, &pkt, 1);
+    status = zx_port_wait(port, ZX_TIME_INFINITE, &pkt);
     if (status != ZX_OK) {
       Log::PrintErr("Process::Wait: zx_port_wait failed: %s\n",
                     zx_status_get_string(status));