diff --git a/scripts/backup-zfs-dataset.sh b/scripts/backup-zfs-dataset.sh
index 54d1bdd..6064dc6 100755
--- a/scripts/backup-zfs-dataset.sh
+++ b/scripts/backup-zfs-dataset.sh
@@ -34,20 +34,20 @@ while [[ $# -gt 0 ]]; do
             destination="${2}"
             shift 2
             ;;
-	-b | --base)
-	    if [ "${create_base:=1}" -ne 1 ]; then
-                >&2 printf "Error: Cannot create base backup when specifying differently.\n"
-		usage
-	    fi
-	    shift 1
-	    ;;
-        -i | --incremental)
-	    if [ "${create_base:=0}" -ne 0 ]; then
-	        >&2 printf "Error: Cannot create incremental backup when specifying differently.\n"
-		usage
+        -b | --base)
+            if [ "${create_base:=1}" -ne 1 ]; then
+                    >&2 printf "Error: Cannot create base backup when specifying differently.\n"
+            usage
             fi
-	    shift 1
-	    ;;
+            shift 1
+            ;;
+        -i | --incremental)
+            if [ "${create_base:=0}" -ne 0 ]; then
+                >&2 printf "Error: Cannot create incremental backup when specifying differently.\n"
+            usage
+                fi
+            shift 1
+            ;;
         -c | --compression_level)
             if ! [[ "${2}" =~ [[:digit:]] ]]; then
                 >&2 printf "Error: Invalid compression level: '%s'\n" "${2}"
@@ -64,10 +64,10 @@ while [[ $# -gt 0 ]]; do
             max_size="${2}"
             shift 2
             ;;
-	-t | --tag)
-	    tag="${2}-"
-	    shift 2
-	    ;;
+        -t | --tag)
+            tag="${2}-"
+            shift 2
+            ;;
         *)
             >&2 printf "Error: Invalid option: '%s'\n" "${1}"
             usage