diff --git a/how-to-create-encrypted-paper-backup/secure-erase.sh b/how-to-create-encrypted-paper-backup/secure-erase.sh
index 6d4e40a..dc76969 100755
--- a/how-to-create-encrypted-paper-backup/secure-erase.sh
+++ b/how-to-create-encrypted-paper-backup/secure-erase.sh
@@ -63,7 +63,7 @@ if [ "$answer" = "y" ]; then
     printf "%s\n" "Overwriting with random data… (round $round of $rounds)"
     sudo dd bs=1M if=/dev/urandom of=$dev || true
   done
-  if [ $zero = true ]; then
+  if [ "$zero" = true ]; then
     printf "%s\n" "Overwriting with zeros…"
     sudo dd bs=1M if=/dev/zero of=$dev || true
   fi
diff --git a/how-to-create-encrypted-paper-backup/secure-erase.sh.sig b/how-to-create-encrypted-paper-backup/secure-erase.sh.sig
index f92a6e5..eb338ee 100644
--- a/how-to-create-encrypted-paper-backup/secure-erase.sh.sig
+++ b/how-to-create-encrypted-paper-backup/secure-erase.sh.sig
@@ -1,16 +1,16 @@
 -----BEGIN PGP SIGNATURE-----
 
-iQIzBAABCgAdFiEEqYzNEiJDZVsm+vthH6dnhiu9EwUFAmC5ILsACgkQH6dnhiu9
-EwVFixAAtDRFRrYsdI9QrRIgJoU3LreVZXNOt7HqXxLn+S6blWVZctdvwgSamqWU
-fXi2bHJbEMlZpfGJsY/LKmWWVz6whQi+oWDw6xEluUjHqyXGplmf281DP0p8HTkH
-u8H3jiSebhdkmoY4bInPtapx366pQHiRBfqQYcJpASelYPm8nPC6Y5i/Gvsj/BYn
-nAiWtsnXHQHea4+3VGREnB63ncmKnRq6KvW0Kgyi1Fc9hlEZHJ3DbXinoQMVHWaO
-oH3J+9GGbj712A/pf8NRmdXzvTBAOXJxhPAKzAH53JyE+Aj0kIq1iWAvHkgCFnwR
-wzUbikaWThzS5FjwPN+0eybHV8OUgCEFKs3VDQK7pD0IXTuzea9uTjSPaSP+Lcsz
-dM3RQw3rCcNk4SYvNAdYOqg+Fl/Vnfeor/bhxzqx4IFbV4LVttpe4Dg6vZrH3NF2
-xiN9B40ECN3lvJu0pM0SJQD/kA/o9ZYy39BDPtK+GHDwtXl+3CyhMmicqWibLHFM
-sZBbxBrSVi6xK36b1Plbr4ATF0aSj0drTe2LaHGuArwYAqgrdrxAMijoVBQ+Z+zq
-uOG4JfAft/xp+2zBrZ+HmRyI+qcp5jqlbhIj6JX1oBvd+ObZJA5scEgzhnKd9eAq
-eiEOsYMjS/LwNtFlCSFvg2l1cZR/1ktvDRT/aJJBFaPn4y4mG20=
-=wojB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+=/N/D
 -----END PGP SIGNATURE-----