diff --git a/src/backends.jl b/src/backends.jl
index 592da1c7..06a71d1f 100644
--- a/src/backends.jl
+++ b/src/backends.jl
@@ -671,6 +671,8 @@ const _gaston_marker = [
     :dtriangle,
     :diamond,
     :pentagon,
+    :hline,
+    :vline,
 ]
 
 const _gaston_scale = [