diff --git a/header-session.go b/header-session.go
index c3b20aef..ccd3b892 100644
--- a/header-session.go
+++ b/header-session.go
@@ -24,6 +24,9 @@ func ReadHeaderSession(in string) (*HeaderSession, error) {
 	hs.Session, parts = parts[0], parts[1:]
 
 	for _, part := range parts {
+		// remove leading spaces
+		part = strings.TrimLeft(part, " ")
+
 		keyval := strings.Split(part, "=")
 		if len(keyval) != 2 {
 			return nil, fmt.Errorf("invalid value")
diff --git a/header-session_test.go b/header-session_test.go
index 6527f791..01d13a90 100644
--- a/header-session_test.go
+++ b/header-session_test.go
@@ -29,6 +29,17 @@ var casesHeaderSession = []struct {
 			}(),
 		},
 	},
+	{
+		"with timeout and space",
+		`A3eqwsafq3rFASqew; timeout=47`,
+		&HeaderSession{
+			Session: "A3eqwsafq3rFASqew",
+			Timeout: func() *uint {
+				v := uint(47)
+				return &v
+			}(),
+		},
+	},
 }
 
 func TestHeaderSession(t *testing.T) {