diff --git a/locales.go b/locales.go
index c43f1be..b14a70f 100644
--- a/locales.go
+++ b/locales.go
@@ -20,7 +20,7 @@ var (
 
 // GetTranslator gets the Translator for the given locale, nil if not found.
 func GetTranslator(locale string) locales.Translator {
-	locale = strings.ToLower(locale)
+	locale = strings.ToLower(strings.ReplaceAll(locale, "-", "_"))
 
 	mu.RLock()
 	t, found := translators[locale]
diff --git a/locales_test.go b/locales_test.go
index 44a029f..5f20082 100644
--- a/locales_test.go
+++ b/locales_test.go
@@ -52,6 +52,12 @@ func TestGetTranslator(t *testing.T) {
 		c.Assert(tnn.MonthWide(d.Month()), qt.Equals, "januar")
 	})
 
+	c.Run("BasicWithHyphenatedKey", func(c *qt.C) {
+		tnn := GetTranslator("nn-NO")
+		c.Assert(tnn, qt.Not(qt.IsNil))
+		c.Assert(tnn.MonthWide(d.Month()), qt.Equals, "januar")
+	})
+
 	// Sample tests; verify that the compression script works correctly.
 	c.Run("Sample", func(c *qt.C) {
 		assertSame(c, GetTranslator("en"), en.New())