diff --git a/sarcophagus b/sarcophagus
index 7150cd1..2205dd2 100755
--- a/sarcophagus
+++ b/sarcophagus
@@ -88,7 +88,7 @@ luks_format() {
     log "Creating container: $img ($size)"
 
     log "→ Allocating sparse file"
-    dd if=/dev/zero of="$img" bs=1M count=0 seek="${size%[KMGT]}" status=none
+    truncate -s "$size" "$img"
     sync
 
     log "→ Formatting LUKS2 (cipher=$CIPHER, pbkdf=argon2id)"