diff --git a/loop/tests/test_sidechain_construction.cc b/loop/tests/test_sidechain_construction.cc
index c9e89166364997a43c0c1015f330e62a9b489336..70c4ea2eaaff04530ffe3fdc2c613abc3a43d46b 100644
--- a/loop/tests/test_sidechain_construction.cc
+++ b/loop/tests/test_sidechain_construction.cc
@@ -88,8 +88,7 @@ BOOST_AUTO_TEST_CASE(test_construct_sidechain_atoms) {
     uint end_idx = all_pos.GetLastIndex(i);
     for(uint j = start_idx; j <= end_idx; ++j){
       Real d = geom::Distance(initial_all_pos.GetPos(j), all_pos.GetPos(j));
-      //largest observed distance in TYR OH
-      BOOST_CHECK(d < 0.53);
+      BOOST_CHECK(d < 0.2);
     }
   } 
 }