1 files changed, 1 insertions, 1 deletions
diff --git a/bs4/element.py b/bs4/element.py
index 2001ad5..8684870 100644
--- a/bs4/element.py
+++ b/bs4/element.py
@@ -163,7 +163,7 @@ class PageElement(object):
             c = XMLFormatter
         else:
             c = HTMLFormatter
-        if callable(formatter):
+        if isinstance(formatter, Callable):
             return c(entity_substitution=formatter)
         return c.REGISTRY[formatter]