diff --git a/mathics/core/builtin.py b/mathics/core/builtin.py
index 269300b2d..4450f70bb 100644
--- a/mathics/core/builtin.py
+++ b/mathics/core/builtin.py
@@ -468,6 +468,8 @@ def get_functions(self, prefix="eval", is_pymodule=False):
         for name in dir(self):
             if name.startswith(prefix):
                 function = getattr(self, name)
+                if not hasattr(function, "__call__"):
+                    continue
                 pattern = function.__doc__
                 if pattern is None:  # Fixes PyPy bug
                     continue