diff --git a/lib/Slic3r/Print/Object.pm b/lib/Slic3r/Print/Object.pm
index eab68309a..107234fb2 100644
--- a/lib/Slic3r/Print/Object.pm
+++ b/lib/Slic3r/Print/Object.pm
@@ -268,7 +268,7 @@ sub generate_support_material {
     }
     
     $self->set_step_done(STEP_SUPPORTMATERIAL);
-    my $stats = "Weight: %.1fg, Cost: %.1f" , $self->print->total_weight, $self->print->total_cost;
+    my $stats = sprintf "Weight: %.1fg, Cost: %.1f" , $self->print->total_weight, $self->print->total_cost;
     $self->print->status_cb->(85, $stats);
 }