diff --git a/src/wallet/rpcwallet.cpp b/src/wallet/rpcwallet.cpp
--- a/src/wallet/rpcwallet.cpp
+++ b/src/wallet/rpcwallet.cpp
@@ -3465,7 +3465,7 @@
             "false) Also select inputs which are watch only\n"
             "     \"lockUnspents\"           (boolean, optional, default "
             "false) Lock selected unspent outputs\n"
-            "     \"reserveChangeKey\"       (boolean, optional, default true) "
+            "     \"reserveChangeKey\"       (boolean, optional) "
             "DEPRECATED.  Reserves the change output key from the keypool\n"
             "     \"feeRate\"                (numeric, optional, default not "
             "set: makes wallet determine the fee) Set a specific feerate (" +
diff --git a/src/wallet/wallet.h b/src/wallet/wallet.h
--- a/src/wallet/wallet.h
+++ b/src/wallet/wallet.h
@@ -988,7 +988,7 @@
                          int &nChangePosInOut, std::string &strFailReason,
                          bool lockUnspents,
                          const std::set<int> &setSubtractFeeFromOutputs,
-                         CCoinControl coinControl, bool keepReserveKey = false);
+                         CCoinControl coinControl, bool keepReserveKey);
     bool SignTransaction(CMutableTransaction &tx);
 
     /**
diff --git a/test/functional/rpc_fundrawtransaction.py b/test/functional/rpc_fundrawtransaction.py
--- a/test/functional/rpc_fundrawtransaction.py
+++ b/test/functional/rpc_fundrawtransaction.py
@@ -709,10 +709,17 @@
         #
         # DEPRECATED, should be removed in v0.20
         # Test address reuse option does #
-        # not work in regular use #
+        # throws an rpc error when not deprecated #
         #
 
-        assert_raises_rpc_error(-32, "fundrawtransaction -reserveChangeKey is deprecated and will be fully removed in v0.20.  To use the -reserveChangeKey option in v0.19, restart bitcoind with -deprecatedrpc=fundrawtransaction.\nProjects should transition to expecting change addresses removed from the keypool before upgrading to v0.20",
+        assert_raises_rpc_error(-32, "fundrawtransaction -reserveChangeKey "
+                                + "is deprecated and will be fully removed "
+                                + "in v0.20.  To use the -reserveChangeKey "
+                                + "option in v0.19, restart bitcoind with "
+                                + "-deprecatedrpc=fundrawtransaction.\n"
+                                + "Projects should transition to expecting "
+                                + "change addresses removed from the keypool "
+                                + "before upgrading to v0.20",
                                 self.nodes[3].fundrawtransaction, rawTx,
                                 {"reserveChangeKey": False})