diff --git a/protocol/rtp/parse_test.go b/protocol/rtp/parse_test.go
index be521a3b..64be4ece 100644
--- a/protocol/rtp/parse_test.go
+++ b/protocol/rtp/parse_test.go
@@ -55,3 +55,30 @@ func TestCsrcCount(t *testing.T) {
 		t.Errorf("unexpected csrc count for RTP packet. Got: %v\n Want: %v\n", got, expect)
 	}
 }
+
+// TestHasExt checks the behaviour of hasExt with an RTP packet that has the
+// extension indicator true, and one with the extension indicator set to false.
+func TestHasExt(t *testing.T) {
+	const ver = 2
+
+	// First check for when there is an extension field.
+	pkt := &Pkt{
+		V: ver,
+		X: true,
+		Extension: ExtensionHeader{
+			ID:     0,
+			Header: make([][4]byte, 0),
+		},
+	}
+	got := hasExt(pkt.Bytes(nil))
+	if !got {
+		t.Error("RTP packet did not have true extension indicator as expected")
+	}
+
+	// Now check when there is not an extension field.
+	pkt.X = false
+	got = hasExt(pkt.Bytes(nil))
+	if got {
+		t.Error("did not expect to have extension indicator as true")
+	}
+}