diff --git a/actions/ost-compare-structures b/actions/ost-compare-structures
index 60a2b8c953ab54481f0c18d14ac6a6e0dc0724cd..0ae1dad2d0dc692b544d05b8f0d8d8408a7b0d01 100644
--- a/actions/ost-compare-structures
+++ b/actions/ost-compare-structures
@@ -522,7 +522,7 @@ def _CheckConsistency(alignments, log_error):
     for alignment in alignments:
         ref_chain = Renumber(alignment.GetSequence(0)).CreateFullView()
         mdl_chain = Renumber(alignment.GetSequence(1)).CreateFullView()
-        new_is_cons = ResidueNamesMatch(ref_chain, mdl_chain, log_error)
+        new_is_cons = ResidueNamesMatch(mdl_chain, ref_chain, log_error)
         is_cons = is_cons and new_is_cons
     return is_cons