diff --git a/duration.go b/duration.go
index f2ab7ff..d9a970a 100644
--- a/duration.go
+++ b/duration.go
@@ -144,6 +144,7 @@ func (d *Duration) UnmarshalText(data []byte) error { // validation is performed
 func ParseDuration(s string) (time.Duration, error) {
 	// NOTE: this code is largely inspired by the standard library.
 	orig := s
+	s = strings.TrimSpace(s)
 	var d uint64
 	neg := false
 
diff --git a/duration_test.go b/duration_test.go
index 5052ee9..9ab05f8 100644
--- a/duration_test.go
+++ b/duration_test.go
@@ -162,6 +162,11 @@ func TestDurationParser(t *testing.T) {
 		"1 m45 s":              time.Minute + 45*time.Second,
 		"1m 45s":               time.Minute + 45*time.Second,
 		"1  minute 45 seconds": time.Minute + 45*time.Second,
+
+		// leading and trailing spaces
+		"  1s ": 1 * time.Second,
+		"1s   ": 1 * time.Second,
+		"   1s": 1 * time.Second,
 	}
 
 	for str, dur := range testcases {