diff --git a/Core/Types/CkanModule.cs b/Core/Types/CkanModule.cs
index eda0d15ebb..12b028b852 100644
--- a/Core/Types/CkanModule.cs
+++ b/Core/Types/CkanModule.cs
@@ -172,7 +172,7 @@ public class CkanModule : IEquatable<CkanModule>
         [JsonProperty("depends", NullValueHandling = NullValueHandling.Ignore)]
         public List<RelationshipDescriptor> depends;
 
-        [JsonProperty("replaced_by")]
+        [JsonProperty("replaced_by", NullValueHandling = NullValueHandling.Ignore)]
         public RelationshipDescriptor replaced_by;
 
         [JsonProperty("download")]