diff --git a/src/interfaces/init.h b/src/interfaces/init.h
index b909c9e6f6b..463d43e7c2e 100644
--- a/src/interfaces/init.h
+++ b/src/interfaces/init.h
@@ -39,6 +39,7 @@ public:
     virtual Ipc* ipc() { return nullptr; }
     virtual bool canListenIpc() { return false; }
     virtual const char* exeName() { return nullptr; }
+    virtual void makeMiningOld2() { throw std::runtime_error("Old mining interface (@2) not supported. Please update your client!"); }
 };
 
 //! Return implementation of Init interface for the node process. If the argv
diff --git a/src/ipc/capnp/init.capnp b/src/ipc/capnp/init.capnp
index 64a7bf9b2b4..a20ef2fcaf3 100644
--- a/src/ipc/capnp/init.capnp
+++ b/src/ipc/capnp/init.capnp
@@ -19,5 +19,8 @@ using Mining = import "mining.capnp";
 interface Init $Proxy.wrap("interfaces::Init") {
     construct @0 (threadMap: Proxy.ThreadMap) -> (threadMap :Proxy.ThreadMap);
     makeEcho @1 (context :Proxy.Context) -> (result :Echo.Echo);
-    makeMining @2 (context :Proxy.Context) -> (result :Mining.Mining);
+    makeMining @3 (context :Proxy.Context) -> (result :Mining.Mining);
+
+    # DEPRECATED: no longer supported; server returns an error.
+    makeMiningOld2 @2 () -> ();
 }
diff --git a/test/functional/interface_ipc.py b/test/functional/interface_ipc.py
index f2c75f6e09f..2fc4497a426 100755
--- a/test/functional/interface_ipc.py
+++ b/test/functional/interface_ipc.py
@@ -68,9 +68,23 @@ class IPCInterfaceTest(BitcoinTestFramework):
 
         asyncio.run(capnp.run(async_routine()))
 
+    def run_deprecated_mining_test(self):
+        self.log.info("Running deprecated mining interface test")
+        async def async_routine():
+            ctx, init = await make_capnp_init_ctx(self)
+            self.log.debug("Calling deprecated makeMiningOld2 should raise an error")
+            try:
+                await init.makeMiningOld2()
+                raise AssertionError("makeMiningOld2 unexpectedly succeeded")
+            except capnp.KjException as e:
+                assert_equal(e.description, "remote exception: std::exception: Old mining interface (@2) not supported. Please update your client!")
+                assert_equal(e.type, "FAILED")
+        asyncio.run(capnp.run(async_routine()))
+
     def run_test(self):
         self.run_echo_test()
         self.run_mining_test()
+        self.run_deprecated_mining_test()
 
 if __name__ == '__main__':
     IPCInterfaceTest(__file__).main()