diff --git a/lib/utils/mu-command-parser.cc b/lib/utils/mu-command-parser.cc
index 719ed393..7c4aa4a9 100644
--- a/lib/utils/mu-command-parser.cc
+++ b/lib/utils/mu-command-parser.cc
@@ -82,6 +82,13 @@ Command::invoke(const Command::CommandMap& cmap, const Node& call)
                                             " but got " + to_string(param_it->type));
         }
 
+        // all passed parameters must be known
+        for (size_t i = 1; i < params.size(); i += 2) {
+                if (std::none_of(cinfo.args.begin(), cinfo.args.end(),
+                                 [&](auto&& arg) {return params[i].value == ":" + arg.first;}))
+                        throw command_error("unknown parameter '" + params[i].value + "'");
+        }
+
         if (cinfo.handler)
                 cinfo.handler(params);
 }
diff --git a/lib/utils/test-command-parser.cc b/lib/utils/test-command-parser.cc
index fad90a48..f18e6425 100644
--- a/lib/utils/test-command-parser.cc
+++ b/lib/utils/test-command-parser.cc
@@ -63,9 +63,11 @@ static void
 test_command()
 {
         using namespace Command;
+        allow_warnings();
 
         CommandMap cmap;
 
+
         cmap.emplace("my-command",
                      CommandInfo{
                              ArgMap{ {"param1", ArgInfo{Sexp::Type::String, true, "some string" }},
@@ -77,13 +79,15 @@ test_command()
 
         g_assert_true(call(cmap, "(my-command :param1 \"hello\")"));
         g_assert_true(call(cmap, "(my-command :param1 \"hello\" :param2 123)"));
-        g_assert_true(call(cmap, "(my-command :param1 \"hello\" :param2 123 :param3 xxx)"));
+
+        g_assert_false(call(cmap, "(my-command :param1 \"hello\" :param2 123 :param3 xxx)"));
 }
 
 static void
 test_command2()
 {
         using namespace Command;
+        allow_warnings();
 
         CommandMap cmap;
         cmap.emplace("bla",
@@ -95,7 +99,8 @@ test_command2()
                            [&](const auto& params){}});
 
 
-        g_assert_true (call(cmap, "(bla :foo nil :bla nil)"));
+        g_assert_true (call(cmap, "(bla :foo nil)"));
+        g_assert_false (call(cmap, "(bla :foo nil :bla nil)"));
 }