diff --git a/reactos/lib/fslib/vfatlib/fat12.c b/reactos/lib/fslib/vfatlib/fat12.c
index f22cb01683d..16dca94701b 100644
--- a/reactos/lib/fslib/vfatlib/fat12.c
+++ b/reactos/lib/fslib/vfatlib/fat12.c
@@ -223,7 +223,7 @@ Fat12WriteRootDirectory(IN HANDLE FileHandle,
   memset(Buffer, 0, 32 * 1024);
 
   Sectors = 32 * 1024 / BootSector->BytesPerSector;
-  for (i = 1; i < RootDirSectors; i += Sectors)
+  for (i = 0; i < RootDirSectors; i += Sectors)
     {
       /* Zero some sectors of the root directory */
       FileOffset.QuadPart = (FirstRootDirSector + i) * BootSector->BytesPerSector;
diff --git a/reactos/lib/fslib/vfatlib/fat16.c b/reactos/lib/fslib/vfatlib/fat16.c
index d7a2877a579..0867d8a08ce 100644
--- a/reactos/lib/fslib/vfatlib/fat16.c
+++ b/reactos/lib/fslib/vfatlib/fat16.c
@@ -226,7 +226,7 @@ Fat16WriteRootDirectory(IN HANDLE FileHandle,
   memset(Buffer, 0, 32 * 1024);
 
   Sectors = 32 * 1024 / BootSector->BytesPerSector;
-  for (i = 1; i < RootDirSectors; i += Sectors)
+  for (i = 0; i < RootDirSectors; i += Sectors)
     {
       /* Zero some sectors of the root directory */
       FileOffset.QuadPart = (FirstRootDirSector + i) * BootSector->BytesPerSector;