diff --git a/nixos/modules/installer/cd-dvd/sd-image.nix b/nixos/modules/installer/cd-dvd/sd-image.nix
index b6e1d11c2b54..e3b1ce3b7c42 100644
--- a/nixos/modules/installer/cd-dvd/sd-image.nix
+++ b/nixos/modules/installer/cd-dvd/sd-image.nix
@@ -135,6 +135,8 @@ in
 
         # Copy the populated /boot into the SD image
         (cd boot; mcopy -bpsvm -i ../bootpart.img ./* ::)
+        # Verify the FAT partition before copying it.
+        fsck.vfat -vn bootpart.img
         dd conv=notrunc if=bootpart.img of=$img seek=$START count=$SECTORS
       '';
     }) {};