diff --git a/ete4/treeview/main.py b/ete4/treeview/main.py
index 3af4faa4e..cb029f815 100644
--- a/ete4/treeview/main.py
+++ b/ete4/treeview/main.py
@@ -17,7 +17,7 @@ def a_wrapper_accepting_arguments(*args, **kargs):
 
 _LINE_TYPE_CHECKER = lambda x: x in (0, 1, 2)
 _SIZE_CHECKER = lambda x: isinstance(x, int)
-_COLOR_MATCH = re.compile(r"^#[A-Fa-f\d]{6}$")
+_COLOR_MATCH = re.compile(r"^#[A-Fa-f\d]{6,8}$")
 _COLOR_CHECKER = lambda x: x.lower() in SVG_COLORS or re.match(_COLOR_MATCH, x)
 _NODE_TYPE_CHECKER = lambda x: x in ["sphere", "circle", "square"]
 _BOOL_CHECKER = lambda x: isinstance(x, bool) or x in (0, 1)