diff --git a/common/WhirlyGlobeLib/include/RawData.h b/common/WhirlyGlobeLib/include/RawData.h
index dba865aa21..b7ffda5ec8 100644
--- a/common/WhirlyGlobeLib/include/RawData.h
+++ b/common/WhirlyGlobeLib/include/RawData.h
@@ -20,6 +20,7 @@
 #import <vector>
 #import <string>
 #import <memory>
+#include <functional>
 #import "WhirlyTypes.h"
 
 namespace WhirlyKit