diff --git a/config.go b/config.go
index b798f75..34a7493 100644
--- a/config.go
+++ b/config.go
@@ -51,7 +51,7 @@ func (l Label) Mlb(startRam, startRom int) string {
 
 	addrStr := fmt.Sprintf("%04X", addr)
 	if l.Size > 1 {
-		addrStr = fmt.Sprintf("%04X-%04X", l.Address, l.Address+l.Size-1)
+		addrStr = fmt.Sprintf("%04X-%04X", addr, addr+l.Size-1)
 	}
 	return fmt.Sprintf("%s:%s:%s:%s", memType, addrStr, l.Name, l.Comment)
 }