diff --git a/.ci/atime/tests.R b/.ci/atime/tests.R
index acadbb50fe..3cd86bb43f 100644
--- a/.ci/atime/tests.R
+++ b/.ci/atime/tests.R
@@ -200,6 +200,7 @@ test.list <- atime::atime_test_list(
       )
     },
     expr = data.table:::`[.data.table`(d, , max(v1) - min(v2), by = id),
+    PR7401="0216983c51e03e3f61d5e6f08f4ba0c42cceb22c", # Merge commit (https://github.com/Rdatatable/data.table/commit/0216983c51e03e3f61d5e6f08f4ba0c42cceb22c) of a PR (https://github.com/Rdatatable/data.table/pull/7401) which increased speed and memory usage of this test (https://github.com/Rdatatable/data.table/issues/7687)
     Before = "7a9eaf62ede487625200981018d8692be8c6f134", # Parent of the first commit (https://github.com/Rdatatable/data.table/commit/515de90a6068911a148e54343a3503043b8bb87c) in the PR (https://github.com/Rdatatable/data.table/pull/4164/commits) that introduced the regression
     Regression = "c152ced0e5799acee1589910c69c1a2c6586b95d", # Parent of the first commit (https://github.com/Rdatatable/data.table/commit/15f0598b9828d3af2eb8ddc9b38e0356f42afe4f) in the PR (https://github.com/Rdatatable/data.table/pull/4558/commits) that fixes the regression
     Fixed = "f750448a2efcd258b3aba57136ee6a95ce56b302"), # Second commit of the PR (https://github.com/Rdatatable/data.table/pull/4558/commits) that fixes the regression