diff --git a/src/ini.cpp b/src/ini.cpp
--- a/src/ini.cpp
+++ b/src/ini.cpp
@@ -112,7 +112,7 @@ bool IniFile::SaveToDisk(const std::stri
 	SHFileOperation(&shfopt);
 #else
 	if (rename(file_new.c_str(), filename.c_str()) < 0) {
-		DEBUG(misc, 0, "Renaming %s to %s failed; configuration not saved", file_new.c_str(), filename.c_str());
+		Debug(misc, 0, "Renaming {} to {} failed; configuration not saved", file_new, filename);
 	}
 #endif