diff --git a/cachier/pickle_core.py b/cachier/pickle_core.py
index fd40a27..a32d1ac 100644
--- a/cachier/pickle_core.py
+++ b/cachier/pickle_core.py
@@ -8,6 +8,7 @@
 # Copyright (c) 2016, Shay Palachy <shaypal5@gmail.com>
 
 import os
+from zlib import adler32
 import pickle  # for local caching
 from datetime import datetime
 import threading
@@ -166,7 +167,7 @@ class _PickleCore(_BaseCore):
         except ImportError:  # pragma: no cover
             pass
         if hasattr(value, "tobytes"):  # For numpy
-            return hash(value.tobytes())
+            return adler32(value.tobytes()) & 0xffffffff
         if hasattr(value, "__iter__"):  # For iterators
             if isinstance(value, (list, tuple)):
                 hash_array = []
@@ -179,7 +180,7 @@ class _PickleCore(_BaseCore):
                 hash_array.append(key)
                 hash_array.append(self._hash_args(elem))
             return tuple(hash_array)
-        return hash(value)
+        return adler32(pickle.dumps(value)) & 0xffffffff
 
     def set_entry(self, key, func_res):
         with self.lock:
diff --git a/tests/prepare_text_caching_test.py b/tests/prepare_text_caching_test.py
index 3ea30ad..f315b24 100644
--- a/tests/prepare_text_caching_test.py
+++ b/tests/prepare_text_caching_test.py
@@ -4,7 +4,9 @@
 from cachier import cachier
 from time import sleep
 from random import random
-from pickle import dump
+from pickle import dump, dumps
+from zlib import adler32
+
 
 TEXT_VAL_TO_CHECK = 'foo'
 TEXT_CACHE_FNAME = 'cachier_text_cache_temp.pkl'
@@ -14,11 +16,12 @@ TEXT_CACHE_FNAME = 'cachier_text_cache_temp.pkl'
 def text_caching(text):
     sleep(1)
     print(text)
-    print(hash(text))
+    print(adler32(dumps(text)) & 0xffffffff)
     return random()
 
 
 if __name__ == '__main__':
+    text_caching.clear_cache()
     return_val = text_caching(TEXT_VAL_TO_CHECK)
     print(return_val)
     with open(TEXT_CACHE_FNAME, 'wb+') as f:
diff --git a/tests/test_pickle_core.py b/tests/test_pickle_core.py
index 9b7e84a..44d6eaa 100644
--- a/tests/test_pickle_core.py
+++ b/tests/test_pickle_core.py
@@ -402,13 +402,14 @@ def test_pickle_core_custom_cache_dir():
 
 
 def test_text_hashing():
-    text = TEXT_VAL_TO_CHECK
     with open(TEXT_CACHE_FNAME, 'rb') as f:
         first = load(f)
     print('\npickled return val found for text cache text:')
     print(first)
     start_time = time()
-    second = text_caching(text)
+    print('calling with value:')
+    print(TEXT_VAL_TO_CHECK)
+    second = text_caching(TEXT_VAL_TO_CHECK)
     print('second value returned:')
     print(second)
     call_time = time() - start_time