diff --git a/modules/Bio/EnsEMBL/Slice.pm b/modules/Bio/EnsEMBL/Slice.pm
index b322d145fecf11e1e3fa6164009a46c28a38dcea..fe2d2764a927732c7001c8a27efe6085867733f1 100644
--- a/modules/Bio/EnsEMBL/Slice.pm
+++ b/modules/Bio/EnsEMBL/Slice.pm
@@ -158,8 +158,8 @@ sub new {
      throw('Cannot create slice on toplevel CoordSystem.');
    }
   } else {
-   warn("SLICE wo CS");
-   warn(stack_trace_dump());
+   warning("Slice without coordinate system");
+   #warn(stack_trace_dump());
   }
 
   $strand ||= 1;