diff --git a/configure.ac b/configure.ac
index 0bec81564..4275796b5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -303,6 +303,7 @@ if test "x$CXXFLAGS_overridden" = "xno"; then
   AX_CHECK_COMPILE_FLAG([-Wformat-security],[WARN_CXXFLAGS="$WARN_CXXFLAGS -Wformat-security"],,[[$CXXFLAG_WERROR]])
   AX_CHECK_COMPILE_FLAG([-Wthread-safety-analysis],[WARN_CXXFLAGS="$WARN_CXXFLAGS -Wthread-safety-analysis"],,[[$CXXFLAG_WERROR]])
   AX_CHECK_COMPILE_FLAG([-Wrange-loop-analysis],[WARN_CXXFLAGS="$WARN_CXXFLAGS -Wrange-loop-analysis"],,[[$CXXFLAG_WERROR]])
+  AX_CHECK_COMPILE_FLAG([-Wredundant-decls],[WARN_CXXFLAGS="$WARN_CXXFLAGS -Wredundant-decls"],,[[$CXXFLAG_WERROR]])
 
   ## Some compilers (gcc) ignore unknown -Wno-* options, but warn about all
   ## unknown options if any other warning is produced. Test the -Wfoo case, and
diff --git a/src/wallet/rpcwallet.cpp b/src/wallet/rpcwallet.cpp
index 4e539a85d..a766874f1 100644
--- a/src/wallet/rpcwallet.cpp
+++ b/src/wallet/rpcwallet.cpp
@@ -4751,17 +4751,16 @@ UniValue walletcreatefundedpsbt(const JSONRPCRequest& request)
     return result;
 }
 
-extern UniValue abortrescan(const JSONRPCRequest& request); // in rpcdump.cpp
-extern UniValue dumpprivkey(const JSONRPCRequest& request); // in rpcdump.cpp
-extern UniValue importprivkey(const JSONRPCRequest& request);
-extern UniValue importaddress(const JSONRPCRequest& request);
-extern UniValue importpubkey(const JSONRPCRequest& request);
-extern UniValue dumpwallet(const JSONRPCRequest& request);
-extern UniValue importwallet(const JSONRPCRequest& request);
-extern UniValue importprunedfunds(const JSONRPCRequest& request);
-extern UniValue removeprunedfunds(const JSONRPCRequest& request);
-extern UniValue importmulti(const JSONRPCRequest& request);
-extern UniValue rescanblockchain(const JSONRPCRequest& request);
+UniValue abortrescan(const JSONRPCRequest& request); // in rpcdump.cpp
+UniValue dumpprivkey(const JSONRPCRequest& request); // in rpcdump.cpp
+UniValue importprivkey(const JSONRPCRequest& request);
+UniValue importaddress(const JSONRPCRequest& request);
+UniValue importpubkey(const JSONRPCRequest& request);
+UniValue dumpwallet(const JSONRPCRequest& request);
+UniValue importwallet(const JSONRPCRequest& request);
+UniValue importprunedfunds(const JSONRPCRequest& request);
+UniValue removeprunedfunds(const JSONRPCRequest& request);
+UniValue importmulti(const JSONRPCRequest& request);
 
 static const CRPCCommand commands[] =
 { //  category              name                                actor (function)                argNames