diff --git a/rustworkx/visualization/graphviz.py b/rustworkx/visualization/graphviz.py
index 6d614e47d..1fae8d99f 100644
--- a/rustworkx/visualization/graphviz.py
+++ b/rustworkx/visualization/graphviz.py
@@ -64,7 +64,8 @@
     "svg",
     "svgz",
     "vml",
-    "vmlz" "vrml",
+    "vmlz",
+    "vrml",
     "vtx",
     "wbmp",
     "xdor",