diff --git a/BUILD.bazel b/BUILD.bazel
index cbf5994..5be2d9b 100644
--- a/BUILD.bazel
+++ b/BUILD.bazel
@@ -399,7 +399,7 @@ BOOMTILE_VARIABLES = SKIP_REPORT_METRICS | FAST_BUILD_SETTINGS | {
     # write_macro_placement macros.tcl
     "SYNTH_HIERARCHICAL": "1",
     "SDC_FILE": "$(location :constraints-boomtile)",
-    "MACRO_PLACE_HALO": "19 19",
+    "MACRO_PLACE_HALO": "2 2",
     "PLACE_PINS_ARGS": "-annealing",
     "MIN_ROUTING_LAYER": "M2",
     "MAX_ROUTING_LAYER": "M7",