diff --git a/src/rpc/rawtransaction.cpp b/src/rpc/rawtransaction.cpp
index d654de18626..400f2f1507a 100644
--- a/src/rpc/rawtransaction.cpp
+++ b/src/rpc/rawtransaction.cpp
@@ -304,7 +304,7 @@ static RPCHelpMan createrawtransaction()
 
     std::optional<bool> rbf;
     if (!request.params[3].isNull()) {
-        rbf = request.params[3].isTrue();
+        rbf = request.params[3].get_bool();
     }
     CMutableTransaction rawTx = ConstructTransaction(request.params[0], request.params[1], request.params[2], rbf);
 
@@ -1449,7 +1449,7 @@ static RPCHelpMan createpsbt()
 
     std::optional<bool> rbf;
     if (!request.params[3].isNull()) {
-        rbf = request.params[3].isTrue();
+        rbf = request.params[3].get_bool();
     }
     CMutableTransaction rawTx = ConstructTransaction(request.params[0], request.params[1], request.params[2], rbf);