diff --git a/network/network.go b/network/network.go
index b68a36742..71c540706 100644
--- a/network/network.go
+++ b/network/network.go
@@ -32,7 +32,7 @@ var _ Network = &network{}
 
 type network struct {
 	ctx            context.Context
-	cancel         func()
+	cancel         context.CancelFunc
 	config         *Config
 	host           lp2phost.Host
 	mdns           *mdnsService
diff --git a/sync/sync.go b/sync/sync.go
index 72879cc1f..7c5819a8a 100644
--- a/sync/sync.go
+++ b/sync/sync.go
@@ -31,7 +31,7 @@ import (
 
 type synchronizer struct {
 	ctx         context.Context
-	cancel      func()
+	cancel      context.CancelFunc
 	config      *Config
 	valKeys     []*bls.ValidatorKey
 	state       state.Facade
diff --git a/www/grpc/server.go b/www/grpc/server.go
index bc9660f9d..ea09583c1 100644
--- a/www/grpc/server.go
+++ b/www/grpc/server.go
@@ -15,7 +15,7 @@ import (
 
 type Server struct {
 	ctx      context.Context
-	cancel   func()
+	cancel   context.CancelFunc
 	config   *Config
 	listener net.Listener
 	address  string
diff --git a/www/http/server.go b/www/http/server.go
index 3aec268a8..ea58e1e08 100644
--- a/www/http/server.go
+++ b/www/http/server.go
@@ -22,7 +22,7 @@ import (
 
 type Server struct {
 	ctx         context.Context
-	cancel      func()
+	cancel      context.CancelFunc
 	config      *Config
 	router      *mux.Router
 	grpcClient  *grpc.ClientConn
diff --git a/www/nanomsg/server.go b/www/nanomsg/server.go
index 1a9aea6a2..d8b62dd36 100644
--- a/www/nanomsg/server.go
+++ b/www/nanomsg/server.go
@@ -15,7 +15,7 @@ import (
 
 type Server struct {
 	ctx       context.Context
-	cancel    func()
+	cancel    context.CancelFunc
 	config    *Config
 	publisher mangos.Socket
 	listener  net.Listener