diff --git a/tests/gh_90.phpt b/tests/gh_90.phpt
index 733b7615..2a16f603 100644
--- a/tests/gh_90.phpt
+++ b/tests/gh_90.phpt
@@ -12,7 +12,7 @@ $memcached = memc_get_instance (array (
 // Create a key for use as a lock.  If this key already exists, wait till it doesn't exist.
 {
     $key = 'LockKey';
-    $lockToken = mt_rand(0, pow(2, 32)); //Random value betwen 0 and 2^32 for ownership verification
+    $lockToken = mt_rand(0, mt_getrandmax()); //Random value for ownership verification
 
     while (true)
     {
@@ -88,4 +88,4 @@ array(10) {
   int(1)
   ["9_%s"]=>
   int(1)
-}
\ No newline at end of file
+}
diff --git a/tests/incrdecr.phpt b/tests/incrdecr.phpt
index cb3914a4..b4e9469b 100644
--- a/tests/incrdecr.phpt
+++ b/tests/incrdecr.phpt
@@ -42,10 +42,10 @@ echo $php_errormsg, "\n";
 var_dump($m->get('foo'));
 
 echo "Enormous offset\n";
-$m->increment('foo', 4294967296);
+$m->increment('foo', 0x7f000000);
 var_dump($m->get('foo'));
 
-$m->decrement('foo', 4294967296);
+$m->decrement('foo', 0x7f000000);
 var_dump($m->get('foo'));
 
 --EXPECT--
@@ -68,5 +68,5 @@ int(1)
 Memcached::decrement(): offset cannot be a negative value
 int(1)
 Enormous offset
-int(4294967297)
+int(2130706433)
 int(1)
diff --git a/tests/incrdecr_bykey.phpt b/tests/incrdecr_bykey.phpt
index 809f3b83..8b931fa7 100644
--- a/tests/incrdecr_bykey.phpt
+++ b/tests/incrdecr_bykey.phpt
@@ -39,10 +39,10 @@ echo $php_errormsg, "\n";
 var_dump($m->get('foo'));
 
 echo "Enormous offset\n";
-$m->incrementByKey('foo', 'foo', 4294967296);
+$m->incrementByKey('foo', 'foo', 0x7f000000);
 var_dump($m->get('foo'));
 
-$m->decrementByKey('foo', 'foo', 4294967296);
+$m->decrementByKey('foo', 'foo', 0x7f000000);
 var_dump($m->get('foo'));
 
 --EXPECT--
@@ -62,5 +62,5 @@ int(1)
 Memcached::decrementByKey(): offset cannot be a negative value
 int(1)
 Enormous offset
-int(4294967297)
+int(2130706433)
 int(1)