diff --git a/src/reflect/scala/reflect/internal/Scopes.scala b/src/reflect/scala/reflect/internal/Scopes.scala
index b98cdff7ab3a..0c306d729587 100644
--- a/src/reflect/scala/reflect/internal/Scopes.scala
+++ b/src/reflect/scala/reflect/internal/Scopes.scala
@@ -83,12 +83,12 @@ trait Scopes extends api.Scopes { self: SymbolTable =>
     /** size and mask of hash tables
      *  todo: make hashtables grow?
      */
-    private val HASHSIZE = 0x80
-    private val HASHMASK = 0x7f
+    private final val HASHSIZE = 0x80
+    private final val HASHMASK = 0x7f
 
     /** the threshold number of entries from which a hashtable is constructed.
      */
-    private val MIN_HASH = 8
+    private final val MIN_HASH = 8
 
     /** Returns a new scope with the same content as this one. */
     def cloneScope: Scope = newScopeWith(this.toList: _*)