diff --git a/src/db/db/dbCellVariants.cc b/src/db/db/dbCellVariants.cc
index 97f3c8c0d..c65d1a7a0 100644
--- a/src/db/db/dbCellVariants.cc
+++ b/src/db/db/dbCellVariants.cc
@@ -52,13 +52,13 @@ db::ICplxTrans OrthogonalTransformationReducer::reduce (const db::ICplxTrans &tr
   } else {
     db::ICplxTrans res;
     double a = trans.angle ();
-    double a90 = floor (a / 90.0 + 0.5) * 90.0;
+    double a90 = floor (a / 90.0 + 0.5 + db::epsilon) * 90.0;
     res.angle (a - a90);
     return res;
   }
 }
 
-db::Trans OrthogonalTransformationReducer::reduce (const db::Trans &trans) const
+db::Trans OrthogonalTransformationReducer::reduce (const db::Trans &) const
 {
   return db::Trans ();
 }