diff --git a/glfw/cocoa_monitor.m b/glfw/cocoa_monitor.m
index 61ea7b363..072eb9f41 100644
--- a/glfw/cocoa_monitor.m
+++ b/glfw/cocoa_monitor.m
@@ -215,7 +215,7 @@ static void endFadeReservation(CGDisplayFadeReservationToken token)
 
 // Finds and caches the NSScreen corresponding to the specified monitor
 //
-bool refreshMonitorScreen(_GLFWmonitor* monitor)
+static bool refreshMonitorScreen(_GLFWmonitor* monitor)
 {
     if (monitor->ns.screen)
         return true;