diff --git a/app.go b/app.go
index 24704e8f7b..65b12f53a8 100644
--- a/app.go
+++ b/app.go
@@ -107,6 +107,8 @@ type App struct {
 	// single-character bool arguments into one
 	// i.e. foobar -o -v -> foobar -ov
 	UseShortOptionHandling bool
+	// SliceFlagSeparator is used to customize the separator for SliceFlag, the default is ","
+	SliceFlagSeparator string
 	// Enable suggestions for commands and flags
 	Suggest bool
 
@@ -241,6 +243,10 @@ func (a *App) Setup() {
 	if a.Metadata == nil {
 		a.Metadata = make(map[string]interface{})
 	}
+
+	if len(a.SliceFlagSeparator) != 0 {
+		defaultSliceFlagSeparator = a.SliceFlagSeparator
+	}
 }
 
 func (a *App) newRootCommand() *Command {
diff --git a/flag.go b/flag.go
index 7535424c04..b66a75da5e 100644
--- a/flag.go
+++ b/flag.go
@@ -15,6 +15,8 @@ import (
 
 const defaultPlaceholder = "value"
 
+var defaultSliceFlagSeparator = ","
+
 var (
 	slPfx = fmt.Sprintf("sl:::%d:::", time.Now().UTC().UnixNano())
 
@@ -378,5 +380,5 @@ func flagFromEnvOrFile(envVars []string, filePath string) (value string, fromWhe
 }
 
 func flagSplitMultiValues(val string) []string {
-	return strings.Split(val, ",")
+	return strings.Split(val, defaultSliceFlagSeparator)
 }
diff --git a/flag_test.go b/flag_test.go
index d46c1a70f7..4a0d6e9396 100644
--- a/flag_test.go
+++ b/flag_test.go
@@ -3384,3 +3384,19 @@ func TestSliceShortOptionHandle(t *testing.T) {
 		t.Fatal("Action callback was never called")
 	}
 }
+
+func TestCustomizedSliceFlagSeparator(t *testing.T) {
+	defaultSliceFlagSeparator = ";"
+	opts := []string{"opt1", "opt2", "opt3,op", "opt4"}
+	ret := flagSplitMultiValues(strings.Join(opts, ";"))
+	defaultSliceFlagSeparator = ","
+	if len(ret) != 4 {
+		t.Fatalf("split slice flag failed, want: 4, but get: %d", len(ret))
+	}
+	for idx, r := range ret {
+		if r != opts[idx] {
+			t.Fatalf("get %dth failed, wanted: %s, but get: %s", idx, opts[idx], r)
+		}
+	}
+}
+