diff --git a/spot/tl/expansions.cc b/spot/tl/expansions.cc
index 1d225b603..f68fb2d9d 100644
--- a/spot/tl/expansions.cc
+++ b/spot/tl/expansions.cc
@@ -1759,7 +1759,11 @@ namespace spot
       }
 
     aut->set_named_prop("state-names", state_names);
-    aut->merge_edges();
+
+    if ((opts & exp_opts_new::MergeEdges)
+        && !(opts & exp_opts_new::UniqueSuffix))
+      aut->merge_edges();
+
     return aut;
   }
 }
diff --git a/spot/tl/expansions.hh b/spot/tl/expansions.hh
index 4286e8fd6..52e83917f 100644
--- a/spot/tl/expansions.hh
+++ b/spot/tl/expansions.hh
@@ -51,6 +51,7 @@ namespace spot
       UniquePrefix = 2,
       BddIsop = 4,
       BddMinterm = 8,
+      MergeEdges = 16,
     };
   };