diff --git a/configurations.yml b/configurations.yml
index 01cec24fe..2fd1985b2 100644
--- a/configurations.yml
+++ b/configurations.yml
@@ -68,6 +68,6 @@ configurations:
 - id: "m-mp"
   options: [*basics, *madagascarMp]
   instanceSets: ["rintanen-aij-2012-interesting"]
-#- id: "gc-ta1-tt1"
-#  options: [*basics, *fastDownwardPreprocessing, *plannerB, *encoding0, *shallow, *heuristics, *generateAndCheck, *testAdd1, *testTimes1]
-#  instanceSets: ["lpnmr-easy-instances", "lpnmr-hard-instances", "lpnmr-first-plan-not-serializable", "rintanen-aij-2012"]
+- id: "gc-ta1-tt1"
+  options: [*basics, *fastDownwardPreprocessing, *plannerB, *encoding0, *shallow, *heuristics, *generateAndCheck, *testAdd1, *testTimes1]
+  instanceSets: ["lpnmr-easy-instances", "lpnmr-hard-instances", "lpnmr-first-plan-not-serializable", "rintanen-aij-2012"]