--- a/bandwidthd.h
+++ b/bandwidthd.h
@@ -120,7 +120,7 @@ struct config
 	char *sensor_id;
 	};
 
-struct SubnetData
+extern struct SubnetData
     {
     uint32_t ip;
     uint32_t mask;
@@ -139,7 +139,7 @@ struct Statistics
 	unsigned long long p2p;
     };
 
-struct IPData
+extern struct IPData
     {
     time_t timestamp;
     uint32_t ip;	// Host byte order