diff --git a/lib/Slic3r/Flow.pm b/lib/Slic3r/Flow.pm
index fed894e970..5ea2ba6361 100644
--- a/lib/Slic3r/Flow.pm
+++ b/lib/Slic3r/Flow.pm
@@ -4,6 +4,7 @@ use warnings;
 
 use parent qw(Exporter);
 
+
 our @EXPORT_OK = qw(FLOW_ROLE_EXTERNAL_PERIMETER FLOW_ROLE_PERIMETER FLOW_ROLE_INFILL
     FLOW_ROLE_SOLID_INFILL
     FLOW_ROLE_TOP_SOLID_INFILL FLOW_ROLE_SUPPORT_MATERIAL