diff --git a/src/dot.cpp b/src/dot.cpp
index c64729a..2c9bd10 100644
--- a/src/dot.cpp
+++ b/src/dot.cpp
@@ -4669,6 +4669,7 @@ void DotGroupCollaboration::Edge::write( FTextStream &t ) const
   {
     case thierarchy :
       arrowStyle = "dir=\"back\", style=\"solid\"";
+      break;
     default :
       t << ", color=\"" << linkTypeColor[(int)eType] << "\"";
       break;
