diff --git a/Sources/Namespace.swift b/Sources/Namespace.swift
index fd62d99..715dd20 100644
--- a/Sources/Namespace.swift
+++ b/Sources/Namespace.swift
@@ -1,4 +1,4 @@
-public protocol FilterType {
+protocol FilterType {
   func invoke(value: Any?, arguments: [Any?]) throws -> Any?
 }
 
diff --git a/Sources/Parser.swift b/Sources/Parser.swift
index c5d6b1b..200d8ac 100644
--- a/Sources/Parser.swift
+++ b/Sources/Parser.swift
@@ -76,7 +76,7 @@ public class TokenParser {
     tokens.insert(token, at: 0)
   }
 
-  public func findFilter(_ name: String) throws -> FilterType {
+  func findFilter(_ name: String) throws -> FilterType {
     if let filter = namespace.filters[name] {
       return filter
     }