diff --git a/src/rpc/util.cpp b/src/rpc/util.cpp
index 3e98e8979..dd5739faf 100644
--- a/src/rpc/util.cpp
+++ b/src/rpc/util.cpp
@@ -65,11 +65,8 @@ void RPCTypeCheckObj(const UniValue& o,
         if (!fAllowNull && v.isNull())
             throw JSONRPCError(RPC_TYPE_ERROR, strprintf("Missing %s", t.first));
 
-        if (!(t.second.typeAny || v.type() == t.second.type || (fAllowNull && v.isNull()))) {
-            std::string err = strprintf("Expected type %s for %s, got %s",
-                uvTypeName(t.second.type), t.first, uvTypeName(v.type()));
-            throw JSONRPCError(RPC_TYPE_ERROR, err);
-        }
+        if (!(t.second.typeAny || v.type() == t.second.type || (fAllowNull && v.isNull())))
+            throw JSONRPCError(RPC_TYPE_ERROR, strprintf("JSON value of type %s for field %s is not of expected type %s", uvTypeName(v.type()),  t.first, uvTypeName(t.second.type)));
     }
 
     if (fStrict)
diff --git a/test/functional/rpc_fundrawtransaction.py b/test/functional/rpc_fundrawtransaction.py
index d67465b64..1152995ac 100755
--- a/test/functional/rpc_fundrawtransaction.py
+++ b/test/functional/rpc_fundrawtransaction.py
@@ -795,7 +795,7 @@ def test_option_feerate(self):
 
         self.log.info("Test fundrawtxn with invalid estimate_mode settings")
         for k, v in {"number": 42, "object": {"foo": "bar"}}.items():
-            assert_raises_rpc_error(-3, "Expected type string for estimate_mode, got {}".format(k),
+            assert_raises_rpc_error(-3, f"JSON value of type {k} for field estimate_mode is not of expected type string",
                 node.fundrawtransaction, rawtx, {"estimate_mode": v, "conf_target": 0.1, "add_inputs": True})
         for mode in ["", "foo", Decimal("3.141592")]:
             assert_raises_rpc_error(-8, 'Invalid estimate_mode parameter, must be one of: "unset", "economical", "conservative"',
@@ -805,7 +805,7 @@ def test_option_feerate(self):
         for mode in ["unset", "economical", "conservative"]:
             self.log.debug("{}".format(mode))
             for k, v in {"string": "", "object": {"foo": "bar"}}.items():
-                assert_raises_rpc_error(-3, "Expected type number for conf_target, got {}".format(k),
+                assert_raises_rpc_error(-3, f"JSON value of type {k} for field conf_target is not of expected type number",
                     node.fundrawtransaction, rawtx, {"estimate_mode": mode, "conf_target": v, "add_inputs": True})
             for n in [-1, 0, 1009]:
                 assert_raises_rpc_error(-8, "Invalid conf_target, must be between 1 and 1008",  # max value of 1008 per src/policy/fees.h
diff --git a/test/functional/rpc_mempool_info.py b/test/functional/rpc_mempool_info.py
index 9b5a3b911..ae9c6572c 100755
--- a/test/functional/rpc_mempool_info.py
+++ b/test/functional/rpc_mempool_info.py
@@ -84,7 +84,7 @@ def create_tx(**kwargs):
         assert_raises_rpc_error(-8, "Invalid parameter, vout cannot be negative", self.nodes[0].gettxspendingprevout, [{'txid' : txidA, 'vout' : -1}])
 
         self.log.info("Invalid txid provided")
-        assert_raises_rpc_error(-3, "Expected type string for txid, got number", self.nodes[0].gettxspendingprevout, [{'txid' : 42, 'vout' : 0}])
+        assert_raises_rpc_error(-3, "JSON value of type number for field txid is not of expected type string", self.nodes[0].gettxspendingprevout, [{'txid' : 42, 'vout' : 0}])
 
         self.log.info("Missing outputs")
         assert_raises_rpc_error(-8, "Invalid parameter, outputs are missing", self.nodes[0].gettxspendingprevout, [])
diff --git a/test/functional/rpc_psbt.py b/test/functional/rpc_psbt.py
index b79b8f518..8243f4373 100755
--- a/test/functional/rpc_psbt.py
+++ b/test/functional/rpc_psbt.py
@@ -275,7 +275,7 @@ def run_test(self):
 
         self.log.info("- raises RPC error with invalid estimate_mode settings")
         for k, v in {"number": 42, "object": {"foo": "bar"}}.items():
-            assert_raises_rpc_error(-3, "Expected type string for estimate_mode, got {}".format(k),
+            assert_raises_rpc_error(-3, f"JSON value of type {k} for field estimate_mode is not of expected type string",
                 self.nodes[1].walletcreatefundedpsbt, inputs, outputs, 0, {"estimate_mode": v, "conf_target": 0.1, "add_inputs": True})
         for mode in ["", "foo", Decimal("3.141592")]:
             assert_raises_rpc_error(-8, 'Invalid estimate_mode parameter, must be one of: "unset", "economical", "conservative"',
@@ -285,7 +285,7 @@ def run_test(self):
         for mode in ["unset", "economical", "conservative"]:
             self.log.debug("{}".format(mode))
             for k, v in {"string": "", "object": {"foo": "bar"}}.items():
-                assert_raises_rpc_error(-3, "Expected type number for conf_target, got {}".format(k),
+                assert_raises_rpc_error(-3, f"JSON value of type {k} for field conf_target is not of expected type number",
                     self.nodes[1].walletcreatefundedpsbt, inputs, outputs, 0, {"estimate_mode": mode, "conf_target": v, "add_inputs": True})
             for n in [-1, 0, 1009]:
                 assert_raises_rpc_error(-8, "Invalid conf_target, must be between 1 and 1008",  # max value of 1008 per src/policy/fees.h
diff --git a/test/functional/wallet_bumpfee.py b/test/functional/wallet_bumpfee.py
index 158ef6611..2ee3e00a7 100755
--- a/test/functional/wallet_bumpfee.py
+++ b/test/functional/wallet_bumpfee.py
@@ -151,7 +151,7 @@ def test_invalid_parameters(self, rbf_node, peer_node, dest_address):
 
         self.log.info("Test invalid estimate_mode settings")
         for k, v in {"number": 42, "object": {"foo": "bar"}}.items():
-            assert_raises_rpc_error(-3, "Expected type string for estimate_mode, got {}".format(k),
+            assert_raises_rpc_error(-3, f"JSON value of type {k} for field estimate_mode is not of expected type string",
                 rbf_node.bumpfee, rbfid, {"estimate_mode": v})
         for mode in ["foo", Decimal("3.1415"), "sat/B", "BTC/kB"]:
             assert_raises_rpc_error(-8, 'Invalid estimate_mode parameter, must be one of: "unset", "economical", "conservative"',
diff --git a/test/functional/wallet_send.py b/test/functional/wallet_send.py
index fb759c153..83b8332c4 100755
--- a/test/functional/wallet_send.py
+++ b/test/functional/wallet_send.py
@@ -362,7 +362,7 @@ def run_test(self):
         for mode in ["economical", "conservative"]:
             for k, v in {"string": "true", "bool": True, "object": {"foo": "bar"}}.items():
                 self.test_send(from_wallet=w0, to_wallet=w1, amount=1, conf_target=v, estimate_mode=mode,
-                    expect_error=(-3, f"Expected type number for conf_target, got {k}"))
+                    expect_error=(-3, f"JSON value of type {k} for field conf_target is not of expected type number"))
 
         # Test setting explicit fee rate just below the minimum of 1 sat/vB.
         self.log.info("Explicit fee rate raises RPC error 'fee rate too low' if fee_rate of 0.99999999 is passed")