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diff --git a/src/plugins/platforms/cocoa/qiosurfacegraphicsbuffer.mm b/src/plugins/platforms/cocoa/qiosurfacegraphicsbuffer.mm
index a367487e..c3aeca1d 100644
--- a/src/plugins/platforms/cocoa/qiosurfacegraphicsbuffer.mm
+++ b/src/plugins/platforms/cocoa/qiosurfacegraphicsbuffer.mm
@@ -49,6 +49,11 @@
// but was only added in the 10.14 SDK, so declare it just in case.
extern "C" CFPropertyListRef CGColorSpaceCopyPropertyList(CGColorSpaceRef space);
+// Introduced in 10.13: http://codeworkshop.net/objc-diff/sdkdiffs/macos/10.13/IOSurface.html
+#if !defined(kIOSurfaceSuccess)
+#define kIOSurfaceSuccess KERN_SUCCESS
+#endif
+
QT_BEGIN_NAMESPACE
Q_LOGGING_CATEGORY(lcQpaIOSurface, "qt.qpa.backingstore.iosurface");
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