diff --git a/asv.go b/asv.go
index 79692aa..c1d1f28 100644
--- a/asv.go
+++ b/asv.go
@@ -61,7 +61,7 @@ func (this *Decoder) ReadFile () (file File, next rune, err error) {
 		group, next, err := this.ReadGroup()
 		file = append(file, group)
 		if err != nil { return file, 0, err }
-		if next >= FileSeparator {
+		if next <= FileSeparator {
 			return file, next, nil
 		}
 	}
@@ -76,7 +76,7 @@ func (this *Decoder) ReadGroup () (group Group, next rune, err error) {
 		record, next, err := this.ReadRecord()
 		group = append(group, record)
 		if err != nil { return group, 0, err }
-		if next >= GroupSeparator {
+		if next <= GroupSeparator {
 			return group, next, nil
 		}
 	}
@@ -91,7 +91,7 @@ func (this *Decoder) ReadRecord () (record Record, next rune, err error) {
 		unit, next, err := this.ReadUnit()
 		record = append(record, unit)
 		if err != nil { return record, 0, err }
-		if next >= RecordSeparator {
+		if next <= RecordSeparator {
 			return record, next, nil
 		}
 	}
@@ -113,7 +113,7 @@ func (this *Decoder) ReadUnit () (unit Unit, next rune, err error) {
 
 		if esc {
 			esc = false
-		} else if char >= FileSeparator && char <= UnitSeparator {
+		} else if IsSeparator(char) {
 			return Unit(str.String()), char, nil
 		}
 		str.WriteRune(char)