diff --git a/time.go b/time.go
index 62b49aa..6d430b2 100644
--- a/time.go
+++ b/time.go
@@ -54,6 +54,7 @@ func FormatAgo(count int, unit string) string {
 }
 
 func normalizeAgoUnit(unit string) string {
+	unit = core.Lower(core.Trim(unit))
 	switch unit {
 	case "seconds":
 		return "second"
diff --git a/time_test.go b/time_test.go
index e9ccc4a..e8b7db5 100644
--- a/time_test.go
+++ b/time_test.go
@@ -173,6 +173,15 @@ func TestFormatAgo_Good_MorePluralUnitAliases(t *testing.T) {
 	}
 }
 
+func TestFormatAgo_Good_NormalisesUnitInput(t *testing.T) {
+	svc, err := New()
+	require.NoError(t, err)
+	SetDefault(svc)
+
+	got := FormatAgo(2, " Hours ")
+	assert.Equal(t, "2 hours ago", got)
+}
+
 func TestFormatAgo_Bad_UnknownUnit(t *testing.T) {
 	svc, err := New()
 	require.NoError(t, err)