diff --git a/helpers/helpers.go b/helpers/helpers.go
index c7ee41d..2484e56 100644
--- a/helpers/helpers.go
+++ b/helpers/helpers.go
@@ -91,15 +91,15 @@ var ProtoHelpersFuncMap = template.FuncMap{
 	"trimstr": func(cutset, s string) string {
 		return strings.Trim(s, cutset)
 	},
-	"index": func(array interface{}, i int) interface{} {
+	"index": func(array interface{}, i int32) interface{} {
 		slice := reflect.ValueOf(array)
 		if slice.Kind() != reflect.Slice {
 			panic("Error in index(): given a non-slice type")
 		}
-		if i < 0 || i >= slice.Len() {
+		if i < 0 || int(i) >= slice.Len() {
 			panic("Error in index(): index out of bounds")
 		}
-		return slice.Index(i).Interface()
+		return slice.Index(int(i)).Interface()
 	},
 	"snakeCase":               xstrings.ToSnakeCase,
 	"getProtoFile":            getProtoFile,