diff --git a/radio/src/targets/simu/simufatfs.cpp b/radio/src/targets/simu/simufatfs.cpp
index 1e428ab9f..443426870 100644
--- a/radio/src/targets/simu/simufatfs.cpp
+++ b/radio/src/targets/simu/simufatfs.cpp
@@ -424,7 +424,7 @@ FRESULT f_readdir (DIR * rep, FILINFO * fil)
   }
 #endif
 
-  memset(fil->fname, 0, SD_SCREEN_FILE_LENGTH);
+  memset(fil->fname, 0, _MAX_LFN);
   strcpy(fil->fname, ent->d_name);
   // TRACE_SIMPGMSPACE("f_readdir(): %s", fil->fname);
   return FR_OK;