diff --git a/src/protocol/proxy.h b/src/protocol/proxy.h
index 1325ccdd0..9cd003a6d 100644
--- a/src/protocol/proxy.h
+++ b/src/protocol/proxy.h
@@ -1,13 +1,14 @@
 #ifndef EL__PROTOCOL_PROXY_H
 #define EL__PROTOCOL_PROXY_H
 
+enum connection_state;
 struct uri;
 
 /* Checks if the passed URI has been configured to go through a proxy. The
  * fragment is removed from the returned URI. */
 /* If @connection_state is non-NULL it will be set to indicate what error
  * occured if the function returns NULL. */
-struct uri *get_proxy_uri(struct uri *uri, int *connection_state);
+struct uri *get_proxy_uri(struct uri *uri, enum connection_state *connection_state);
 
 /* ``Translates'' the passed URI into the URI being proxied. If it is not a
  * proxy:// URI it will return the URI with the fragment removed.  */