diff --git a/src/output.cpp b/src/output.cpp
index 1040cb09c..46c1d6a8c 100644
--- a/src/output.cpp
+++ b/src/output.cpp
@@ -10,9 +10,18 @@
 #include <cstring>
 #include <stdexcept>
 
+#include <boost/filesystem.hpp>
 #include <boost/property_tree/json_parser.hpp>
 #include <boost/property_tree/ptree.hpp>
 
+static std::string adapt_relative_filename(std::string const &lua_file,
+                                           std::string const &style_file)
+{
+    boost::filesystem::path base_path{style_file};
+    return boost::filesystem::absolute(lua_file, base_path.parent_path())
+        .string();
+}
+
 namespace pt = boost::property_tree;
 
 namespace {
@@ -37,8 +46,11 @@ parse_multi_single(pt::ptree const &conf,
     std::string name = conf.get<std::string>("name");
     std::string proc_type = conf.get<std::string>("type");
 
-    new_opts.tag_transform_script =
-        conf.get_optional<std::string>("tagtransform");
+    auto const opt_script = conf.get_optional<std::string>("tagtransform");
+    if (opt_script) {
+        new_opts.tag_transform_script =
+            adapt_relative_filename(opt_script.get(), options.style);
+    }
 
     new_opts.tag_transform_node_func =
         conf.get_optional<std::string>("tagtransform-node-function");
diff --git a/src/tagtransform-lua.cpp b/src/tagtransform-lua.cpp
index b579cdf47..eb1a48474 100644
--- a/src/tagtransform-lua.cpp
+++ b/src/tagtransform-lua.cpp
@@ -4,20 +4,10 @@ extern "C"
 #include <lualib.h>
 }
 
-#include <boost/filesystem.hpp>
-
 #include "format.hpp"
 #include "options.hpp"
 #include "tagtransform-lua.hpp"
 
-static std::string adapt_relative_filename(std::string const &lua_file,
-                                           std::string const &style_file)
-{
-    boost::filesystem::path base_path{style_file};
-    return boost::filesystem::absolute(lua_file, base_path.parent_path())
-        .string();
-}
-
 lua_tagtransform_t::lua_tagtransform_t(options_t const *options)
 : m_node_func(
       options->tag_transform_node_func.get_value_or("filter_tags_node")),
@@ -26,8 +16,7 @@ lua_tagtransform_t::lua_tagtransform_t(options_t const *options)
       options->tag_transform_rel_func.get_value_or("filter_basic_tags_rel")),
   m_rel_mem_func(options->tag_transform_rel_mem_func.get_value_or(
       "filter_tags_relation_member")),
-  m_lua_file(adapt_relative_filename(options->tag_transform_script.get(),
-                                     options->style)),
+  m_lua_file(options->tag_transform_script.get()),
   m_extra_attributes(options->extra_attributes)
 {
     open_style();