diff --git a/code/ryzom/tools/patch_gen/patch_gen_common.cpp b/code/ryzom/tools/patch_gen/patch_gen_common.cpp
index 90b42ca72..590c0320a 100644
--- a/code/ryzom/tools/patch_gen/patch_gen_common.cpp
+++ b/code/ryzom/tools/patch_gen/patch_gen_common.cpp
@@ -342,7 +342,7 @@ void CPackageDescription::generatePatches(CBNPFileSet& packageIndex) const
 		std::string prevVersionFileName;
 		if (packageIndex.getFile(i).versionCount()==1)
 		{
-			prevVersionFileName= tmpnam(NULL);
+			prevVersionFileName= _RootDirectory + "empty";
 			NLMISC::COFile tmpFile(prevVersionFileName);
 			tmpFile.close();
 		}