diff --git a/frame.go b/frame.go
index 6ad64a352..26d1bdf3f 100644
--- a/frame.go
+++ b/frame.go
@@ -328,7 +328,7 @@ func (f *Frame) applyOptions(opt FrameOptions) error {
 		// Create new bsiGroup.
 		bsig := &bsiGroup{
 			Name: f.name,
-			Type: FieldTypeInt,
+			Type: bsiGroupTypeInt,
 			Min:  opt.Min,
 			Max:  opt.Max,
 		}
@@ -1070,14 +1070,14 @@ func decodeFrameOptions(options *internal.FrameMeta) *FrameOptions {
 	}
 }
 
-// List of field data types.
+// List of bsiGroup types.
 const (
-	FieldTypeInt = "int"
+	bsiGroupTypeInt = "int"
 )
 
 func IsValidFieldType(v string) bool {
 	switch v {
-	case FieldTypeInt:
+	case bsiGroupTypeInt:
 		return true
 	default:
 		return false
diff --git a/frame_internal_test.go b/frame_internal_test.go
index c52b76658..749e4e720 100644
--- a/frame_internal_test.go
+++ b/frame_internal_test.go
@@ -25,20 +25,20 @@ import (
 func TestField_BaseValue(t *testing.T) {
 	b0 := &bsiGroup{
 		Name: "b0",
-		Type: FieldTypeInt,
+		Type: bsiGroupTypeInt,
 		Min:  -100,
 		Max:  900,
 	}
 	b1 := &bsiGroup{
 		Name: "b1",
-		Type: FieldTypeInt,
+		Type: bsiGroupTypeInt,
 		Min:  0,
 		Max:  1000,
 	}
 
 	b2 := &bsiGroup{
 		Name: "b2",
-		Type: FieldTypeInt,
+		Type: bsiGroupTypeInt,
 		Min:  100,
 		Max:  1100,
 	}