diff --git a/lib/Slic3r/Print/Object.pm b/lib/Slic3r/Print/Object.pm
index 11f7b6f29..d8e41d77e 100644
--- a/lib/Slic3r/Print/Object.pm
+++ b/lib/Slic3r/Print/Object.pm
@@ -459,7 +459,7 @@ sub generate_support_material {
     $self->_support_material->generate($self);
     
     $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);
 }