diff --git a/test/functional/rpc_psbt.py b/test/functional/rpc_psbt.py
index ec52bfdcc0..9bdaa5311d 100755
--- a/test/functional/rpc_psbt.py
+++ b/test/functional/rpc_psbt.py
@@ -106,6 +106,7 @@ def run_test(self):
 
         # Make sure that a psbt with signatures cannot be converted
         signedtx = self.nodes[0].signrawtransactionwithwallet(rawtx['hex'])
+        assert_raises_rpc_error(-22, "Inputs must not have scriptWitnesses", self.nodes[0].converttopsbt, signedtx['hex'], False)
         assert_raises_rpc_error(-22, "Inputs must not have scriptWitnesses", self.nodes[0].converttopsbt, signedtx['hex'])
 
         # Explicitly allow converting non-empty txs