diff --git a/symengine/lib/symengine_wrapper.in.pyx b/symengine/lib/symengine_wrapper.in.pyx
index 7b574c6e..552c9b74 100644
--- a/symengine/lib/symengine_wrapper.in.pyx
+++ b/symengine/lib/symengine_wrapper.in.pyx
@@ -1557,9 +1557,6 @@ cdef class BooleanFalse(BooleanAtom):
     def _sage_(self):
         return False
 
-    def __nonzero__(self):
-        return False
-
     def __bool__(self):
         return False