diff --git a/src/corelib/kernel/qeventdispatcher_unix_p.h b/src/corelib/kernel/qeventdispatcher_unix_p.h
index df080809b67..32c9de03fa8 100644
--- a/src/corelib/kernel/qeventdispatcher_unix_p.h
+++ b/src/corelib/kernel/qeventdispatcher_unix_p.h
@@ -84,6 +84,11 @@ public:
 
 };
 
+#ifdef check
+// defined in Apple's /usr/include/AssertMacros.h header
+#  undef check
+#endif
+
 class QEventDispatcherUNIXPrivate;
 
 #ifdef Q_OS_QNX