diff --git a/src/jack_proxy.hpp b/src/jack_proxy.hpp
index 02bf7f3..a05341f 100644
--- a/src/jack_proxy.hpp
+++ b/src/jack_proxy.hpp
@@ -73,8 +73,8 @@ public:
 	void
 	stop_server();
 
-	sigc::signal<void> signal_started;
-	sigc::signal<void> signal_stopped;
+	sigc::signal0<void> signal_started;
+	sigc::signal0<void> signal_stopped;
 
 private:
 	void error_msg(const std::string& msg) const;
diff --git a/src/lash_client.hpp b/src/lash_client.hpp
index cde0fe6..8c455a6 100644
--- a/src/lash_client.hpp
+++ b/src/lash_client.hpp
@@ -50,7 +50,7 @@ public:
 	do_rename(
 		const string& name);
 
-	signal<void> _signal_renamed;
+	signal0<void> _signal_renamed;
 
 private:
 	friend class lash_proxy_impl;
diff --git a/src/project.hpp b/src/project.hpp
index 7599ff0..3f1f1bc 100644
--- a/src/project.hpp
+++ b/src/project.hpp
@@ -67,12 +67,12 @@ public:
 	do_change_notes(
 		const string& notes);
 
-	signal<void> _signal_renamed;
-	signal<void> _signal_modified_status_changed;
-	signal<void> _signal_description_changed;
-	signal<void> _signal_notes_changed;
-	signal<void, shared_ptr<lash_client> > _signal_client_added;
-	signal<void, shared_ptr<lash_client> > _signal_client_removed;
+	signal0<void> _signal_renamed;
+	signal0<void> _signal_modified_status_changed;
+	signal0<void> _signal_description_changed;
+	signal0<void> _signal_notes_changed;
+	signal1<void, shared_ptr<lash_client> > _signal_client_added;
+	signal1<void, shared_ptr<lash_client> > _signal_client_removed;
 
 private:
 	friend class lash_proxy_impl;
diff --git a/src/session.hpp b/src/session.hpp
index 5e454bf..6106e45 100644
--- a/src/session.hpp
+++ b/src/session.hpp
@@ -52,8 +52,8 @@ public:
 
 	shared_ptr<lash_client> find_client_by_id(const string& id);
 
-	sigc::signal<void, shared_ptr<project> > _signal_project_added;
-	sigc::signal<void, shared_ptr<project> > _signal_project_closed;
+	sigc::signal1<void, shared_ptr<project> > _signal_project_added;
+	sigc::signal1<void, shared_ptr<project> > _signal_project_closed;
 
 private:
 	session_impl * _impl_ptr;