diff --git a/test/functional/feature_framework_unit_tests.py b/test/functional/feature_framework_unit_tests.py
index f03f084bed8..14d83f8a707 100755
--- a/test/functional/feature_framework_unit_tests.py
+++ b/test/functional/feature_framework_unit_tests.py
@@ -27,6 +27,7 @@ TEST_FRAMEWORK_MODULES = [
     "crypto.ripemd160",
     "crypto.secp256k1",
     "script",
+    "script_util",
     "segwit_addr",
     "wallet_util",
 ]
diff --git a/test/functional/rpc_createmultisig.py b/test/functional/rpc_createmultisig.py
index fdac3623d3c..37656341d26 100755
--- a/test/functional/rpc_createmultisig.py
+++ b/test/functional/rpc_createmultisig.py
@@ -12,6 +12,7 @@ from test_framework.address import address_to_scriptpubkey
 from test_framework.descriptors import descsum_create, drop_origins
 from test_framework.key import ECPubKey
 from test_framework.messages import COIN
+from test_framework.script_util import keys_to_multisig_script
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import (
     assert_raises_rpc_error,
@@ -69,6 +70,16 @@ class RpcCreateMultiSigTest(BitcoinTestFramework):
         # Check that bech32m is currently not allowed
         assert_raises_rpc_error(-5, "createmultisig cannot create bech32m multisig addresses", self.nodes[0].createmultisig, 2, self.pub, "bech32m")
 
+        self.log.info('Check correct encoding of multisig script for all n (1..20)')
+        for nkeys in range(1, 20+1):
+            keys = [self.pub[0]]*nkeys
+            expected_ms_script = keys_to_multisig_script(keys, k=nkeys)  # simply use n-of-n
+            # note that the 'legacy' address type fails for n values larger than 15
+            # due to exceeding the P2SH size limit (520 bytes), so we use 'bech32' instead
+            # (for the purpose of this encoding test, we don't care about the resulting address)
+            res = self.nodes[0].createmultisig(nrequired=nkeys, keys=keys, address_type='bech32')
+            assert_equal(res['redeemScript'], expected_ms_script.hex())
+
     def check_addmultisigaddress_errors(self):
         if self.options.descriptors:
             return
diff --git a/test/functional/test_framework/script_util.py b/test/functional/test_framework/script_util.py
index 62894cc0f44..855f3b8cf59 100755
--- a/test/functional/test_framework/script_util.py
+++ b/test/functional/test_framework/script_util.py
@@ -3,10 +3,13 @@
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 """Useful Script constants and utils."""
+import unittest
+
 from test_framework.script import (
     CScript,
-    CScriptOp,
     OP_0,
+    OP_15,
+    OP_16,
     OP_CHECKMULTISIG,
     OP_CHECKSIG,
     OP_DUP,
@@ -49,10 +52,8 @@ def keys_to_multisig_script(keys, *, k=None):
     if k is None:  # n-of-n multisig by default
         k = n
     assert k <= n
-    op_k = CScriptOp.encode_op_n(k)
-    op_n = CScriptOp.encode_op_n(n)
     checked_keys = [check_key(key) for key in keys]
-    return CScript([op_k] + checked_keys + [op_n, OP_CHECKMULTISIG])
+    return CScript([k] + checked_keys + [n, OP_CHECKMULTISIG])
 
 
 def keyhash_to_p2pkh_script(hash):
@@ -125,3 +126,19 @@ def check_script(script):
     if isinstance(script, bytes) or isinstance(script, CScript):
         return script
     assert False
+
+
+class TestFrameworkScriptUtil(unittest.TestCase):
+    def test_multisig(self):
+        fake_pubkey = bytes([0]*33)
+        # check correct encoding of P2MS script with n,k <= 16
+        normal_ms_script = keys_to_multisig_script([fake_pubkey]*16, k=15)
+        self.assertEqual(len(normal_ms_script), 1 + 16*34 + 1 + 1)
+        self.assertTrue(normal_ms_script.startswith(bytes([OP_15])))
+        self.assertTrue(normal_ms_script.endswith(bytes([OP_16, OP_CHECKMULTISIG])))
+
+        # check correct encoding of P2MS script with n,k > 16
+        max_ms_script = keys_to_multisig_script([fake_pubkey]*20, k=19)
+        self.assertEqual(len(max_ms_script), 2 + 20*34 + 2 + 1)
+        self.assertTrue(max_ms_script.startswith(bytes([1, 19])))  # using OP_PUSH1
+        self.assertTrue(max_ms_script.endswith(bytes([1, 20, OP_CHECKMULTISIG])))