diff --git a/lib/shoulda/matchers/active_model/validate_inclusion_of_matcher.rb b/lib/shoulda/matchers/active_model/validate_inclusion_of_matcher.rb
index 9395cb5bd..f43ace91f 100644
--- a/lib/shoulda/matchers/active_model/validate_inclusion_of_matcher.rb
+++ b/lib/shoulda/matchers/active_model/validate_inclusion_of_matcher.rb
@@ -344,6 +344,7 @@ def with_low_message(message)
 
         def with_high_message(message)
           if message
+            @expects_custom_validation_message = true
             @high_message = message
           end