diff --git a/include/chaiscript/dispatchkit/proxy_functions.hpp b/include/chaiscript/dispatchkit/proxy_functions.hpp
index 6128b33..a5c2526 100644
--- a/include/chaiscript/dispatchkit/proxy_functions.hpp
+++ b/include/chaiscript/dispatchkit/proxy_functions.hpp
@@ -846,7 +846,8 @@ namespace chaiscript
                          plist.begin(),
                          std::back_inserter(newplist),
                          [](const Type_Info &ti, const Boxed_Value &param) -> Boxed_Value {
-                           if (ti.is_arithmetic() && param.get_type_info().is_arithmetic()) {
+                           if (ti.is_arithmetic() && param.get_type_info().is_arithmetic()
+                               && param.get_type_info() != ti) {
                              return Boxed_Number(param).get_as(ti).bv;
                            } else {
                              return param;
@@ -854,8 +855,6 @@ namespace chaiscript
                          }
                        );
 
-
-
           try {
             return (*(matching_func->second))(newplist, t_conversions);
           } catch (const exception::bad_boxed_cast &) {
diff --git a/include/chaiscript/dispatchkit/type_info.hpp b/include/chaiscript/dispatchkit/type_info.hpp
index c43767a..eac984d 100644
--- a/include/chaiscript/dispatchkit/type_info.hpp
+++ b/include/chaiscript/dispatchkit/type_info.hpp
@@ -60,6 +60,16 @@ namespace chaiscript
         return m_type_info < ti.m_type_info;
       }
 
+      CHAISCRIPT_CONSTEXPR bool operator!=(const Type_Info &ti) const CHAISCRIPT_NOEXCEPT
+      {
+        return !(operator==(ti));
+      }
+
+      CHAISCRIPT_CONSTEXPR bool operator!=(const std::type_info &ti) const CHAISCRIPT_NOEXCEPT
+      {
+        return !(operator==(ti));
+      }
+
       CHAISCRIPT_CONSTEXPR bool operator==(const Type_Info &ti) const CHAISCRIPT_NOEXCEPT
       {
         return ti.m_type_info == m_type_info
diff --git a/unittests/compiled_tests.cpp b/unittests/compiled_tests.cpp
index edc62e2..71fc59c 100644
--- a/unittests/compiled_tests.cpp
+++ b/unittests/compiled_tests.cpp
@@ -950,4 +950,24 @@ TEST_CASE("Parse floats with non-posix locale")
 
 
 
+bool FindBitmap(int &ox, int &oy, long) {
+  ox = 1; 
+  oy = 2; 
+  return true;
+}
+
+TEST_CASE("Mismatched numeric types only convert necessary params")
+{
+  chaiscript::ChaiScript chai;
+
+  chai.add(chaiscript::fun(&FindBitmap), "FindBitmap");
+  int x = 0;
+  int y = 0;
+  chai.add(chaiscript::var(&x), "x");
+  chai.add(chaiscript::var(&y), "y");
+  chai.eval( "if ( FindBitmap ( x, y, 0) ) { print(\"found at \" + to_string(x) + \", \" + to_string(y))}" );
+  CHECK(x == 1);
+  CHECK(y == 2);
+
+}