1 files changed, 19 insertions, 5 deletions
diff --git a/multi_string_flag.go b/multi_string_flag.go
index 699529a0..ab22b14d 100644
--- a/multi_string_flag.go
+++ b/multi_string_flag.go
@@ -7,15 +7,24 @@ import (
 
 var errMultiStringSetEmptyValue = errors.New("value cannot be empty")
 
+const defaultSeparator = ","
+
 // MultiStringFlag implements the flag.Value interface and allows a string flag
 // to be specified multiple times on the command line.
 //
 // e.g.: -listen-http 127.0.0.1:80 -listen-http [::1]:80
-type MultiStringFlag []string
+type MultiStringFlag struct {
+	value     []string
+	separator string
+}
 
 // String returns the list of parameters joined with a commas (",")
 func (s *MultiStringFlag) String() string {
-	return strings.Join(*s, ",")
+	if s.separator == "" {
+		s.separator = defaultSeparator
+	}
+
+	return strings.Join(s.value, s.separator)
 }
 
 // Set appends the value to the list of parameters
@@ -23,14 +32,19 @@ func (s *MultiStringFlag) Set(value string) error {
 	if value == "" {
 		return errMultiStringSetEmptyValue
 	}
-	*s = append(*s, value)
+
+	s.value = append(s.value, value)
 	return nil
 }
 
 // Split each flag
 func (s *MultiStringFlag) Split() (result []string) {
-	for _, str := range *s {
-		result = append(result, strings.Split(str, ",")...)
+	if s.separator == "" {
+		s.separator = defaultSeparator
+	}
+
+	for _, str := range s.value {
+		result = append(result, strings.Split(str, s.separator)...)
 	}
 
 	return