diff --git a/History.txt b/History.txt
index 75f0698..17507e1 100644
--- a/History.txt
+++ b/History.txt
@@ -1,3 +1,8 @@
+= 1.5.0.5
+
+* Remove native C CRC32_ITU_T extension in favor of Zlib's crc32 method.
+  memcache-client is now pure Ruby again and will work with JRuby and Rubinius.
+
 = 1.5.0.4
 
 * Get test suite working again (packagethief)
diff --git a/ext/crc32/crc32.c b/ext/crc32/crc32.c
deleted file mode 100644
index a6a1b7a..0000000
--- a/ext/crc32/crc32.c
+++ /dev/null
@@ -1,38 +0,0 @@
-#include "ruby.h"
-#include "stdio.h"
-
-static VALUE t_itu_t(VALUE self, VALUE string) {
-  VALUE str = StringValue(string);
-#ifdef RSTRING_LEN
-  int   n = RSTRING_LEN(str);
-#else
-  int   n = RSTRING(str)->len;
-#endif
-
-#ifdef RSTRING_PTR
-  char* p = RSTRING_PTR(str);
-#else
-  char* p = RSTRING(str)->ptr;
-#endif
-
-  unsigned long r = 0xFFFFFFFF;
-  int i, j;
-
-  for (i = 0; i < n; i++) {
-    r = r ^ p[i];
-    for (j = 0; j < 8; j++) {
-      if ( (r & 1) != 0 ) {
-        r = (r >> 1) ^ 0xEDB88320;
-      } else {
-        r = r >> 1;
-      }
-    }
-  }
-  return INT2FIX(r ^ 0xFFFFFFFF);
-}
-
-VALUE cCRC32;
-void Init_crc32() {
-  cCRC32 = rb_define_module("CRC32");
-  rb_define_module_function(cCRC32, "itu_t", t_itu_t, 1);
-}
diff --git a/ext/crc32/extconf.rb b/ext/crc32/extconf.rb
deleted file mode 100644
index f14de51..0000000
--- a/ext/crc32/extconf.rb
+++ /dev/null
@@ -1,5 +0,0 @@
-require 'mkmf'
-
-dir_config("crc32")
-
-create_makefile("crc32")
diff --git a/lib/memcache.rb b/lib/memcache.rb
index c445d79..2c6a412 100644
--- a/lib/memcache.rb
+++ b/lib/memcache.rb
@@ -4,38 +4,7 @@
 require 'thread'
 require 'timeout'
 require 'rubygems'
-
-class String
-
-  ##
-  # Uses the ITU-T polynomial in the CRC32 algorithm.
-  begin
-    require 'crc32'
-    def crc32_ITU_T
-      CRC32.itu_t(self)
-    end
-  rescue LoadError => e
-    puts "Loading with slow CRC32 ITU-T implementation: #{e.message}"
-    
-    def crc32_ITU_T
-      r = 0xFFFFFFFF
-
-      each_byte do |i|
-        r ^= i
-        8.times do
-          if (r & 1) != 0 then
-            r = (r>>1) ^ 0xEDB88320
-          else
-            r >>= 1
-          end
-        end
-      end
-
-      r ^ 0xFFFFFFFF
-    end
-  end
-  
-end
+require 'zlib'
 
 ##
 # A Ruby client library for memcached.
@@ -500,7 +469,7 @@ def get_server_for_key(key)
   # sketchy for down servers).
 
   def hash_for(key)
-    (key.crc32_ITU_T >> 16) & 0x7fff
+    (Zlib.crc32(key) >> 16) & 0x7fff
   end
 
   ##
diff --git a/memcache-client.gemspec b/memcache-client.gemspec
index 3e69c0d..9cccb81 100644
--- a/memcache-client.gemspec
+++ b/memcache-client.gemspec
@@ -1,15 +1,14 @@
 Gem::Specification.new do |s|
 	s.name = 'memcache-client'
-	s.version = '1.5.0.4'
+	s.version = '1.5.0.5'
 	s.authors = ['Eric Hodel', 'Robert Cottrell', 'Mike Perham']
 	s.email = 'mperham@gmail.com'
 	s.homepage = 'http://github.com/fiveruns/memcache-client'
 	s.summary = 'A Ruby-based memcached client library'
 	s.description = s.summary
-	s.extensions << 'ext/crc32/extconf.rb'
 
 	s.require_path = 'lib'
 
-	s.files = ["README.txt", "License.txt", "History.txt", "Rakefile", "lib/memcache.rb", "lib/memcache_util.rb", "ext/crc32/crc32.c"]
+	s.files = ["README.txt", "License.txt", "History.txt", "Rakefile", "lib/memcache.rb", "lib/memcache_util.rb"]
 	s.test_files = ["test/test_mem_cache.rb"]
 end
diff --git a/test/test_mem_cache.rb b/test/test_mem_cache.rb
index d9316b8..769aade 100644
--- a/test/test_mem_cache.rb
+++ b/test/test_mem_cache.rb
@@ -164,17 +164,6 @@ def test_cache_get_multi_bad_state
     assert_match /get my_namespace:key\r\n/, server.socket.written.string
   end
 
-  def test_crc32_ITU_T
-    assert_equal 0, ''.crc32_ITU_T
-    # First value is the fast C version, last value is the pure Ruby version
-    assert_in [-886631737, 1260851911], 'my_namespace:key'.crc32_ITU_T
-    assert_in [-224284233, 870540390], 'my_name√space:key'.crc32_ITU_T
-  end
-  
-  def assert_in(possible_values, value)
-    assert possible_values.include?(value), "#{possible_values.inspect} should contain #{value}"
-  end
-
   def test_initialize
     cache = MemCache.new :namespace => 'my_namespace', :readonly => true