diff --git a/stringutil/concat.go b/stringutil/concat.go
index 7944b01..007b228 100644
--- a/stringutil/concat.go
+++ b/stringutil/concat.go
@@ -18,6 +18,9 @@ package stringutil
 
 // Concat concatenates parts of a string together.
 func Concat(parts ...string) string {
+	if len(parts) == 1 {
+		return parts[0]
+	}
 	n := 0
 	for _, part := range parts {
 		n += len(part)
diff --git a/stringutil/string_test.go b/stringutil/string_test.go
index 9415d10..81e9b5e 100644
--- a/stringutil/string_test.go
+++ b/stringutil/string_test.go
@@ -23,6 +23,9 @@ import (
 )
 
 func TestConcat(t *testing.T) {
+	if ret := Concat("1"); ret != "1" {
+		t.Fatal("Concat(1):", ret)
+	}
 	if ret := Concat("1", "23", "!"); ret != "123!" {
 		t.Fatal("Concat:", ret)
 	}