diff --git a/src/_macosx.m b/src/_macosx.m
index cd0ef14008e7..2f075ec28b73 100644
--- a/src/_macosx.m
+++ b/src/_macosx.m
@@ -3554,7 +3554,7 @@ static void _data_provider_release(void* info, const void* data, size_t size)
 
     NSBitmapImageRep* rep = [NSBitmapImageRep imageRepWithData:data];
 
-    NSSize pxlSize = NSMakeSize(rep.pixelsWide, rep.pixelsHigh);
+    NSSize pxlSize = NSMakeSize([rep pixelsWide], [rep pixelsHigh]);
     NSSize newSize = NSMakeSize(72.0 * pxlSize.width / dpi, 72.0 * pxlSize.height / dpi);
 
     [rep setSize:newSize];