--- a/dom/bindings/parser/WebIDL.py
+++ b/dom/bindings/parser/WebIDL.py
@@ -834,17 +834,17 @@ class IDLInterface(IDLObjectWithScope):
                                       [attr.location])
 
                 if self.ctor():
                     raise WebIDLError("Constructor and NoInterfaceObject are incompatible",
                                       [self.location])
 
                 self._noInterfaceObject = True
             elif identifier == "Constructor" or identifier == "NamedConstructor":
-                if not self.hasInterfaceObject():
+                if identifier == "Constructor" and not self.hasInterfaceObject():
                     raise WebIDLError(str(identifier) + " and NoInterfaceObject are incompatible",
                                       [self.location])
 
                 if identifier == "NamedConstructor" and not attr.hasValue():
                     raise WebIDLError("NamedConstructor must either take an identifier or take a named argument list",
                                       [attr.location])
 
                 args = attr.args() if attr.hasArgs() else []

--- a/dom/bindings/parser/tests/test_constructor_no_interface_object.py
+++ b/dom/bindings/parser/tests/test_constructor_no_interface_object.py
@@ -21,8 +21,16 @@ def WebIDLTest(parser, harness):
             };
         """)
 
         results = parser.finish()
     except:
         threw = True
 
     harness.ok(threw, "Should have thrown.")
+
+    parser.parse("""
+        [NoInterfaceObject, NamedConstructor=FooBar]
+        interface TestNamedConstructorNoInterfaceObject {
+        };
+    """)
+
+    parser = parser.reset()