diff --git a/spec/interactors/problem_updater_cache_spec.rb b/spec/interactors/problem_updater_cache_spec.rb
index ff6f743..5a7a66f 100644
--- a/spec/interactors/problem_updater_cache_spec.rb
+++ b/spec/interactors/problem_updater_cache_spec.rb
@@ -74,7 +74,7 @@ describe ProblemUpdaterCache do
         end
 
         it 'update first_notice_at' do
-          expect(problem.first_notice_at.to_time).to eq notice.created_at.to_time
+          expect(problem.first_notice_at.to_i).to be_within(1).of(notice.created_at.to_i)
         end
 
         it 'update last_notice_at' do
diff --git a/spec/models/problem_spec.rb b/spec/models/problem_spec.rb
index a39a64f..71005a2 100644
--- a/spec/models/problem_spec.rb
+++ b/spec/models/problem_spec.rb
@@ -57,10 +57,10 @@ describe Problem do
       problem.should_not be_nil
 
       notice1 = Fabricate(:notice, :err => err)
-      problem.first_notice_at.should == notice1.created_at
+      expect(problem.first_notice_at.to_i).to be_within(1).of(notice.created_at.to_i)
 
       notice2 = Fabricate(:notice, :err => err)
-      problem.first_notice_at.to_time.should eq notice1.created_at
+      expect(problem.first_notice_at.to_i).to be_within(1).of(notice.created_at.to_i)
     end
   end
 
--
libgit2 0.21.2