diff --git a/Classes/GlobalStateExplorers/SystemLog/ActivityStreamAPI.h b/Classes/GlobalStateExplorers/SystemLog/ActivityStreamAPI.h
index 8da9b84aef..0702db593a 100644
--- a/Classes/GlobalStateExplorers/SystemLog/ActivityStreamAPI.h
+++ b/Classes/GlobalStateExplorers/SystemLog/ActivityStreamAPI.h
@@ -14,6 +14,8 @@
 #ifndef ActivityStreamSPI_h
 #define ActivityStreamSPI_h
 
+#include <Foundation/Foundation.h>
+
 #include <sys/time.h>
 // #include <xpc/xpc.h>