diff --git a/sidechain/src/rotamer.cc b/sidechain/src/rotamer.cc
index aa4a399ff804c90247a3a048de8349c3cc8f2786..7e84c43cad901685683f90c518d0db0deb6acbe3 100644
--- a/sidechain/src/rotamer.cc
+++ b/sidechain/src/rotamer.cc
@@ -54,6 +54,7 @@ void RRMRotamer::ApplyOnResidue(ost::mol::ResidueHandle& res,
     ed.RenameResidue(res, new_res_name);
     res.SetOneLetterCode(ost::conop::ResidueNameToOneLetterCode(new_res_name));
   }
+  ed.UpdateICS();
 }