diff --git a/src/main/scala/spray/json/ProductFormats.scala b/src/main/scala/spray/json/ProductFormats.scala
index c3a94e18..8b5843f3 100644
--- a/src/main/scala/spray/json/ProductFormats.scala
+++ b/src/main/scala/spray/json/ProductFormats.scala
@@ -50,7 +50,7 @@ trait ProductFormats extends ProductFormatsInstances {
             if (reader.isInstanceOf[OptionFormat[_]]) None.asInstanceOf[T]
             else deserializationError("Object is missing required member '" + fieldName + "'", e)
         }
-      case _ => deserializationError("Object expected in field " + fieldName)
+      case _ => deserializationError("Object expected in field '" + fieldName + "'")
     }
   }
 
diff --git a/src/test/scala/spray/json/ProductFormatsSpec.scala b/src/test/scala/spray/json/ProductFormatsSpec.scala
index af04505d..c969a6f4 100644
--- a/src/test/scala/spray/json/ProductFormatsSpec.scala
+++ b/src/test/scala/spray/json/ProductFormatsSpec.scala
@@ -62,7 +62,7 @@ class ProductFormatsSpec extends Specification {
       JsObject("b" -> JsNumber(4.2), "a" -> JsNumber(42)).convertTo[Test2] mustEqual obj
     }
     "throw a DeserializationException if the JsValue is not a JsObject" in (
-      JsNull.convertTo[Test2] must throwA(new DeserializationException("Object expected"))
+      JsNull.convertTo[Test2] must throwA(new DeserializationException("Object expected in field 'a'"))
     )
   }