diff --git a/src/CouchDB.Driver/Translators/ConstantExpressionTranslator.cs b/src/CouchDB.Driver/Translators/ConstantExpressionTranslator.cs
index 55fe0c1..e0c9486 100644
--- a/src/CouchDB.Driver/Translators/ConstantExpressionTranslator.cs
+++ b/src/CouchDB.Driver/Translators/ConstantExpressionTranslator.cs
@@ -56,6 +56,9 @@ private void HandleConstant(object constant)
                             _sb.Append(JsonConvert.SerializeObject(constant));
                         }
                         break;
+                    case TypeCode.Int32:
+                        _sb.Append((int)constant);
+                        break;
                     default:
                         _sb.Append(constant);
                         break;
diff --git a/tests/CouchDB.Driver.UnitTests/Find/Find_Selector_Conditions.cs b/tests/CouchDB.Driver.UnitTests/Find/Find_Selector_Conditions.cs
index c60d022..2fce5e3 100644
--- a/tests/CouchDB.Driver.UnitTests/Find/Find_Selector_Conditions.cs
+++ b/tests/CouchDB.Driver.UnitTests/Find/Find_Selector_Conditions.cs
@@ -96,6 +96,12 @@ public void Array_InSingleItem()
             Assert.Equal(@"{""selector"":{""age"":{""$in"":[20]}}}", json);
         }
         [Fact]
+        public void Array_InEnum()
+        {
+            var json = _rebels.Where(r => r.Species.In(new[] { Species.Human, Species.Droid })).ToString();
+            Assert.Equal(@"{""selector"":{""species"":{""$in"":[0,1]}}}", json);
+        }
+        [Fact]
         public void Array_NotIn()
         {
             var json = _rebels.Where(r => !r.Age.In(new[] { 20, 30 })).ToString();