diff --git a/apps/mwiniimporter/importer.cpp b/apps/mwiniimporter/importer.cpp
index 9a76adeed8f..041712b2160 100644
--- a/apps/mwiniimporter/importer.cpp
+++ b/apps/mwiniimporter/importer.cpp
@@ -87,7 +87,7 @@ void MwIniImporter::merge(strmap &cfg, strmap &ini) {
     }
 }
 
-bool MwIniImporter::specialMerge(std::string cfgKey, std::string iniKey, strmap cfg, strmap ini) {
+bool MwIniImporter::specialMerge(std::string cfgKey, std::string iniKey, strmap &cfg, strmap &ini) {
     return false;
 }
 
diff --git a/apps/mwiniimporter/importer.hpp b/apps/mwiniimporter/importer.hpp
index 3ab1d892eea..d0034a13d44 100644
--- a/apps/mwiniimporter/importer.hpp
+++ b/apps/mwiniimporter/importer.hpp
@@ -22,7 +22,7 @@ class MwIniImporter {
     void    writeToFile(std::string file, strmap &cfg);
     
   private:
-    bool   specialMerge(std::string cfgKey, std::string iniKey, strmap cfg, strmap ini);
+    bool   specialMerge(std::string cfgKey, std::string iniKey, strmap &cfg, strmap &ini);
     bool mVerbose;
     strmap mMergeMap;
 };