diff --git a/src/jsTypeFactory.cc b/src/jsTypeFactory.cc
index 60834188..3e4f89d3 100644
--- a/src/jsTypeFactory.cc
+++ b/src/jsTypeFactory.cc
@@ -382,7 +382,7 @@ bool callPyFunc(JSContext *cx, unsigned int argc, JS::Value *vp) {
     if (PyMethod_Check(pyFunc)) {
       f = PyMethod_Function(pyFunc); // borrowed reference
       nNormalArgs -= 1; // don't include the implicit `self` of the method as an argument
-    }
+    } 
     PyCodeObject *bytecode = (PyCodeObject *)PyFunction_GetCode(f); // borrowed reference
     PyObject *defaults = PyFunction_GetDefaults(f); // borrowed reference
     nDefaultArgs = defaults ? PyTuple_Size(defaults) : 0;
@@ -393,7 +393,7 @@ bool callPyFunc(JSContext *cx, unsigned int argc, JS::Value *vp) {
   }
 
   // use faster calling if no arguments are needed
-  if (((nNormalArgs + nDefaultArgs) == 0 && !varargs)) {
+  if (((nNormalArgs + nDefaultArgs) <= 0 && !varargs)) {
     #if PY_VERSION_HEX >= 0x03090000
     pyRval = PyObject_CallNoArgs(pyFunc);
     #else
diff --git a/tests/python/test_functions_this.py b/tests/python/test_functions_this.py
index dc20f416..d9cbf528 100644
--- a/tests/python/test_functions_this.py
+++ b/tests/python/test_functions_this.py
@@ -202,3 +202,17 @@ def pyFunc():
   pm.collect()  # this should collect the JS proxy to pyFunc, which should decref pyFunc
   # pyFunc should be collected by now
   assert ref[0]() is None
+
+
+def test_method_no_self():
+  class What:
+    def some_method():
+        return 3
+
+  obj = What()
+
+  try:
+    pm.eval('x => x.some_method()')(obj)
+    assert (False)
+  except pm.SpiderMonkeyError as e:
+    assert 'takes 0 positional arguments but 1 was given' in str(e)
\ No newline at end of file