diff --git a/lib/travis/addons/slack/task.rb b/lib/travis/addons/slack/task.rb
index 43caadef..4f0e1022 100644
--- a/lib/travis/addons/slack/task.rb
+++ b/lib/travis/addons/slack/task.rb
@@ -3,8 +3,8 @@ module Addons
     module Slack
       class Task < Travis::Task
 
-        BRANCH_BUILD_MESSAGE_TEMPLATE = "Build <%{build_url}|#%{build_number}> (<%{compare_url}|%{commit}>) of %{repository}@%{branch} by %{author} %{result} in %{duration}"
-        PULL_REQUEST_MESSAGE_TEMPLATE = "Build <%{build_url}|#%{build_number}> (<%{compare_url}|%{commit}>) of %{repository}@%{branch} in PR <%{pull_request_url}|#%{pull_request_number}> by %{author} %{result} in %{duration}"
+        BRANCH_BUILD_MESSAGE_TEMPLATE = "Build <%{build_url}|#%{build_number}> (<%{compare_url}|%{commit}>) of %{repository}@%{branch} by %{author} %{result} in %{elapsed_time}"
+        PULL_REQUEST_MESSAGE_TEMPLATE = "Build <%{build_url}|#%{build_number}> (<%{compare_url}|%{commit}>) of %{repository}@%{branch} in PR <%{pull_request_url}|#%{pull_request_number}> by %{author} %{result} in %{elapsed_time}"
 
         def process(timeout)
           targets.each do |target|