diff --git a/crypto/rand/default.go b/crypto/rand/default.go
index 87aab7d4c..432be66b1 100644
--- a/crypto/rand/default.go
+++ b/crypto/rand/default.go
@@ -33,8 +33,8 @@ func init() {
 }
 
 func (p *lockingPRNG) Read(s []byte) (n int, err error) {
-	globalRand.mu.Lock()
-	defer globalRand.mu.Unlock()
+	p.mu.Lock()
+	defer p.mu.Unlock()
 
 	return p.PRNG.Read(s)
 }