diff --git a/tests/lean/simp_loop.lean b/tests/lean/slow/simp_loop.lean
similarity index 100%
rename from tests/lean/simp_loop.lean
rename to tests/lean/slow/simp_loop.lean
diff --git a/tests/lean/simp_loop.lean.expected.out b/tests/lean/slow/simp_loop.lean.expected.out
similarity index 100%
rename from tests/lean/simp_loop.lean.expected.out
rename to tests/lean/slow/simp_loop.lean.expected.out