diff --git a/include/indentlog/color.hpp b/include/indentlog/color.hpp
index 37e0b072..7e600fa4 100644
--- a/include/indentlog/color.hpp
+++ b/include/indentlog/color.hpp
@@ -169,8 +169,8 @@ namespace xo {
     } /*color_on_xterm*/
 
     inline color_impl<int>
-    color_on(color_encoding encoding, std::uint32_t color) {
-        return color_impl<int>(CF_ColorOn, color_spec(encoding, color), 0);
+    color_on(color_spec spec) {
+        return color_impl<int>(CF_ColorOn, spec, 0);
     } /*color_on*/
 
     inline color_impl<int>
diff --git a/include/indentlog/function.hpp b/include/indentlog/function.hpp
index 4b44c2a8..85727eb9 100644
--- a/include/indentlog/function.hpp
+++ b/include/indentlog/function.hpp
@@ -256,13 +256,13 @@ namespace xo {
             os << "[" << with_color(color_spec(fn.encoding(), fn.color()), fn.pretty()) << "]";
             break;
         case FS_Simple:
-            os << color_on(fn.encoding(), fn.color());
+            os << color_on(color_spec(fn.encoding(), fn.color()));
             function_name::print_simple(os, fn.pretty());
             os << color_off();
             break;
         case FS_Streamlined:
             /* omit namespace qualifiers and template arguments */
-            os << color_on(fn.encoding(), fn.color());
+            os << color_on(color_spec(fn.encoding(), fn.color()));
             function_name::print_streamlined(os, fn.pretty());
             os << color_off();
             break;