diff --git a/pandas/core/computation/expressions.py b/pandas/core/computation/expressions.py
index 8205534c9d48b..43b6a6fb64314 100644
--- a/pandas/core/computation/expressions.py
+++ b/pandas/core/computation/expressions.py
@@ -128,8 +128,9 @@ def _evaluate_numexpr(op, op_str, a, b):
     roperator.rsub: "-",
     operator.truediv: "/",
     roperator.rtruediv: "/",
-    operator.floordiv: "//",
-    roperator.rfloordiv: "//",
+    # floordiv not supported by numexpr 2.x
+    operator.floordiv: None,
+    roperator.rfloordiv: None,
     # we require Python semantics for mod of negative for backwards compatibility
     # see https://github.com/pydata/numexpr/issues/365
     # so sticking with unaccelerated for now