diff --git a/src/cocoa_window.m b/src/cocoa_window.m
index 527423ee..5bb1289b 100644
--- a/src/cocoa_window.m
+++ b/src/cocoa_window.m
@@ -31,6 +31,10 @@
 #include <float.h>
 #include <string.h>
 
+// HACK: This enum value is missing from framework headers on OS X 10.11 despite
+//       having been (according to documentation) added in Mac OS X 10.7
+#define NSWindowCollectionBehaviorFullScreenNone (1 << 9)
+
 // Returns whether the cursor is in the content area of the specified window
 //
 static GLFWbool cursorInContentArea(_GLFWwindow* window)