diff --git a/jnius/__init__.py b/jnius/__init__.py
index 8ac24eb..34c2599 100644
--- a/jnius/__init__.py
+++ b/jnius/__init__.py
@@ -15,15 +15,17 @@ from .reflect import *
 # XXX monkey patch methods that cannot be in cython.
 # Cython doesn't allow to set new attribute on methods it compiled
 
+HASHCODE_MAX = 2 ** 31 - 1
+
 class PythonJavaClass_(PythonJavaClass):
 
     @java_method('()I', name='hashCode')
     def hashCode(self):
-        return id(self)
+        return id(self) % HASHCODE_MAX
 
     @java_method('()Ljava/lang/String;', name='hashCode')
     def hashCode_(self):
-        return '{}'.format(id(self))
+        return '{}'.format(self.hashCode())
 
     @java_method('()Ljava/lang/String;', name='toString')
     def toString(self):