diff --git a/lib/avro/datum.php b/lib/avro/datum.php
index b328853..8e74252 100644
--- a/lib/avro/datum.php
+++ b/lib/avro/datum.php
@@ -358,7 +358,7 @@ static function float_to_int_bits($float)
    */
   static function double_to_long_bits($double)
   {
-    return pack('d', (double) $double);
+    return pack('d', (float) $double);
   }
 
   /**
@@ -1014,7 +1014,7 @@ static public function int_bits_to_float($bits)
   static public function long_bits_to_double($bits)
   {
     $double = unpack('d', $bits);
-    return (double) $double[1];
+    return (float) $double[1];
   }
 
   /**
@@ -1060,7 +1060,7 @@ public function read_null() { return null; }
    */
   public function read_boolean()
   {
-    return (boolean) (1 == ord($this->next_byte()));
+    return (bool) (1 == ord($this->next_byte()));
   }
 
   /**