diff --git a/inst/atime/tests.R b/inst/atime/tests.R
index cdbc7326e..a02f07b52 100644
--- a/inst/atime/tests.R
+++ b/inst/atime/tests.R
@@ -86,7 +86,7 @@ test.list <- list(
         key = "g")
       dt_mod <- copy(dt)
     }),
-    Before = "19b7866112614db53eb3e909c097407d91cd6738", # Parent of the regression commit (https://github.com/Rdatatable/data.table/commit/0895fa247afcf6b38044bd5f56c0d209691ddb31), which is the parent of the first commit in the PR that causes the issue (https://github.com/Rdatatable/data.table/pull/5493/commits) 
-    Regression = "0895fa247afcf6b38044bd5f56c0d209691ddb31", # The regression commit is the parent of the first commit in the PR that fixed the issue (https://github.com/Rdatatable/data.table/pull/5493/commits)
+    Before = "be2f72e6f5c90622fe72e1c315ca05769a9dc854", # Commit preceding the regression causing commit (https://github.com/Rdatatable/data.table/pull/4491/commits/e793f53466d99f86e70fc2611b708ae8c601a451) in the PR that introduced the issue (https://github.com/Rdatatable/data.table/pull/4491/commits)
+    Regression = "e793f53466d99f86e70fc2611b708ae8c601a451", # Commit responsible for regression in the PR that introduced the issue (https://github.com/Rdatatable/data.table/pull/4491/commits)
     Fixed = "58409197426ced4714af842650b0cc3b9e2cb842") # Last commit in the PR that fixed the regression (https://github.com/Rdatatable/data.table/pull/5463/commits)    
 )