diff --git a/src/file_cache_row.cpp b/src/file_cache_row.cpp
index 4d0e096..5173109 100644
--- a/src/file_cache_row.cpp
+++ b/src/file_cache_row.cpp
@@ -14,7 +14,7 @@
 file_cache_row::file_cache_row(): td(-1),status(INVALID),size(0),available_bytes(0),n_clients(0),startOffset(0),modified(false),handle(0)
 {
 	std::string filename = Config::getInstance()->CACHEPATH + "/mega.XXXXXX";
-	close (mkstemp(&filename[0]));
+	close (mkstemp(filename.c_str()));
 	localname = filename;
 	printf("creato il file %s\n",localname.c_str());
 }