diff --git a/drivers/mtd/smart.c b/drivers/mtd/smart.c
index c5c6e80a3e9..e483bc99d3f 100644
--- a/drivers/mtd/smart.c
+++ b/drivers/mtd/smart.c
@@ -1368,7 +1368,8 @@ static int smart_add_sector_to_cache(FAR struct smart_struct_s *dev,
   index = 1;
   if (dev->cache_entries < CONFIG_MTD_SMART_SECTOR_CACHE_SIZE)
     {
-      index = dev->cache_entries++;
+      oldest = 0;
+      index  = dev->cache_entries++;
     }
   else
     {
@@ -1387,7 +1388,7 @@ static int smart_add_sector_to_cache(FAR struct smart_struct_s *dev,
           if (dev->sCache[x].birth < oldest)
             {
               oldest = dev->sCache[x].birth;
-              index = x;
+              index  = x;
             }
         }
     }