diff --git a/Src/Util/ConfigBuilders.cpp b/Src/Util/ConfigBuilders.cpp
index 007f0e5..eb9ce11 100644
--- a/Src/Util/ConfigBuilders.cpp
+++ b/Src/Util/ConfigBuilders.cpp
@@ -248,7 +248,7 @@ namespace Util
       file.open(filename);
       if (file.fail())
       {
-        ErrorLog("Unable to write to '%s'. Configuration will not be saved.");
+        ErrorLog("Unable to write to '%s'. Configuration will not be saved.", filename.c_str());
         return;
       }
       if (!header_comment.empty())