diff --git a/protocol/czar/err.go b/protocol/czar/err.go
index 92d412e..a6263ea 100644
--- a/protocol/czar/err.go
+++ b/protocol/czar/err.go
@@ -6,7 +6,7 @@ import (
 
 // Err is an object that will only store an error once.
 type Err struct {
-	mux sync.Mutex // Guards following
+	mux *sync.Mutex // Guards following
 	err error
 	sig chan struct{}
 }
@@ -36,7 +36,7 @@ func (e *Err) Sig() <-chan struct{} {
 
 func NewErr() *Err {
 	return &Err{
-		mux: sync.Mutex{},
+		mux: &sync.Mutex{},
 		err: nil,
 		sig: make(chan struct{}),
 	}
diff --git a/protocol/czar/priority.go b/protocol/czar/priority.go
index ed776ce..8e0df12 100644
--- a/protocol/czar/priority.go
+++ b/protocol/czar/priority.go
@@ -6,9 +6,9 @@ import (
 
 // Priority implement a lock with three priorities.
 type Priority struct {
-	l sync.Mutex
-	m sync.Mutex
-	h sync.Mutex
+	l *sync.Mutex
+	m *sync.Mutex
+	h *sync.Mutex
 }
 
 // H executes function f with 0 priority.
@@ -41,8 +41,8 @@ func (p *Priority) L(f func() error) error {
 // NewPriority returns a new Priority.
 func NewPriority() *Priority {
 	return &Priority{
-		l: sync.Mutex{},
-		m: sync.Mutex{},
-		h: sync.Mutex{},
+		l: &sync.Mutex{},
+		m: &sync.Mutex{},
+		h: &sync.Mutex{},
 	}
 }