diff --git a/go.mod b/go.mod
index d216642..4db07f8 100644
--- a/go.mod
+++ b/go.mod
@@ -1,4 +1,4 @@
-module github.com/philpearl/stringbank
+module github.com/ou05020/stringbank
 
 go 1.12
 
diff --git a/stringbank.go b/stringbank.go
index b89e679..e614ffc 100644
--- a/stringbank.go
+++ b/stringbank.go
@@ -74,6 +74,9 @@ func (s *Stringbank) reserve(l int) (index int, data []byte) {
 }
 
 func spaceForLength(len int) int {
+	if len == 0 {
+		return 1
+	}
 	// 7 bits => 1 byte
 	// 8 bits => 2 byte
 	// 1