1 files changed, 1 insertions, 1 deletions
diff --git a/Python/specialize.c b/Python/specialize.c
index fe4a65ee5f8..7861f3845bf 100644
--- a/Python/specialize.c
+++ b/Python/specialize.c
@@ -2147,7 +2147,7 @@ specialize_c_call(PyObject *callable, _Py_CODEUNIT *instr, int nargs)
             }
             /* len(o) */
             PyInterpreterState *interp = _PyInterpreterState_GET();
-            if (callable == interp->callable_cache.len) {
+            if (callable == interp->callable_cache.len && instr->op.arg == 1) {
                 specialize(instr, CALL_LEN);
                 return 0;
             }