diff --git a/zpay32/invoice_internal_test.go b/zpay32/invoice_internal_test.go
index 99fa8375..50596baf 100644
--- a/zpay32/invoice_internal_test.go
+++ b/zpay32/invoice_internal_test.go
@@ -149,10 +149,6 @@ func TestEncodeAmount(t *testing.T) {
 		valid  bool
 		result string
 	}{
-		{
-			msat:  -10,   // mSat
-			valid: false, // negative amount
-		},
 		{
 			msat:   1, // mSat
 			valid:  true,