diff --git a/src/vnet/policer/policer.h b/src/vnet/policer/policer.h
index 8e2d7c7..b7c1d61 100644
--- a/src/vnet/policer/policer.h
+++ b/src/vnet/policer/policer.h
@@ -44,7 +44,7 @@
   vnet_main_t *vnet_main;
 } vnet_policer_main_t;
 
-vnet_policer_main_t vnet_policer_main;
+extern vnet_policer_main_t vnet_policer_main;
 
 typedef enum
 {