diff --git a/README.md b/README.md
index 99adad14..eedfda91 100644
--- a/README.md
+++ b/README.md
@@ -114,7 +114,7 @@ Configuration
 ------------------------
 Dalli::Client accepts the following options. All times are in seconds.
 
-**expires_in**: Global default for key TTL.  No default.
+**expires_in**: Global default for key TTL.  Default is 0, which means no expiry.
 
 **failover**: Boolean, if true Dalli will failover to another server if the main server for a key is down.
 
diff --git a/lib/dalli/ring.rb b/lib/dalli/ring.rb
index 5ee0af0d..11c23402 100644
--- a/lib/dalli/ring.rb
+++ b/lib/dalli/ring.rb
@@ -79,9 +79,9 @@ def entry_count_for(server, total_servers, total_weight)
       inline do |builder|
         builder.c <<-EOM
         int binary_search(VALUE ary, unsigned int r) {
-            int upper = RARRAY_LEN(ary) - 1;
-            int lower = 0;
-            int idx = 0;
+            long upper = RARRAY_LEN(ary) - 1;
+            long lower = 0;
+            long idx = 0;
             ID value = rb_intern("value");
             VALUE continuumValue;
             unsigned int l;