diff --git a/app/models/policies.rb b/app/models/policies.rb
index 5521d9562..5ec1534f5 100644
--- a/app/models/policies.rb
+++ b/app/models/policies.rb
@@ -56,8 +56,8 @@ def self.with_attribute(attr)
   ]
 
   def self.prohibited_policy_combination?(policies)
-    policies.combination(2).any? do |policy1, policy2|
-      INVALID_POLICY_COMBINATIONS.include?([policy1, policy2].sort_by(&:to_s))
+    policies.permutation(2).any? do |policy1, policy2|
+      INVALID_POLICY_COMBINATIONS.include?([policy1, policy2])
     end
   end
 end
diff --git a/spec/models/policies_spec.rb b/spec/models/policies_spec.rb
index 90baa6c32..6a1fb701c 100644
--- a/spec/models/policies_spec.rb
+++ b/spec/models/policies_spec.rb
@@ -58,12 +58,4 @@
       end
     end
   end
-
-  describe "::INVALID_POLICY_COMBINATIONS" do
-    it "contains subarrays that are sorted alphabetically" do
-      Policies::INVALID_POLICY_COMBINATIONS.each do |subarray|
-        expect(subarray).to eq(subarray.sort_by(&:to_s))
-      end
-    end
-  end
 end