diff --git a/benchmarks/benchmark.rb b/benchmarks/benchmark.rb
index 49c7a789..8e3b0922 100644
--- a/benchmarks/benchmark.rb
+++ b/benchmarks/benchmark.rb
@@ -48,15 +48,18 @@ class Benchmarks
       def run_hamlit; #{Hamlit::Engine.new.call @haml_code}; end
     }
 
-    bench('erubis')      { context.run_erubis }
-    bench('slim')        { context.run_slim_ugly }
-    bench('fast_haml')   { context.run_fast_haml }
-    bench('tenjin')      { context.run_tenjin }
-    bench('fast erubis') { context.run_fast_erubis }
-    bench('temple erb')  { context.run_temple_erb }
-    bench('erb')         { context.run_erb }
-    bench('hamlit')      { context.run_hamlit }
-    bench('haml')        { context.run_haml_ugly }
+    bench('erubis')        { context.run_erubis }
+    bench('slim')          { context.run_slim_ugly }
+    bench('fast_haml')     { context.run_fast_haml }
+    bench('hamlit')        { context.run_hamlit }
+
+    if ENV['ALL']
+      bench('tenjin')      { context.run_tenjin }
+      bench('fast erubis') { context.run_fast_erubis }
+      bench('temple erb')  { context.run_temple_erb }
+      bench('erb')         { context.run_erb }
+      bench('haml')        { context.run_haml_ugly }
+    end
   end
 
   def run
diff --git a/wercker.yml b/wercker.yml
index 6c8fa512..c0abd049 100644
--- a/wercker.yml
+++ b/wercker.yml
@@ -32,4 +32,4 @@ build:
 
     - script:
         name: run benchmarks
-        code: bundle exec rake bench
+        code: ALL=true bundle exec rake bench