diff --git a/GitVersionCore/BuildServers/ContinuaCi.cs b/GitVersionCore/BuildServers/ContinuaCi.cs
index d57084637a..4ad16c0936 100644
--- a/GitVersionCore/BuildServers/ContinuaCi.cs
+++ b/GitVersionCore/BuildServers/ContinuaCi.cs
@@ -42,7 +42,7 @@ public override string[] GenerateSetParameterMessage(string name, string value)
         {
             return new[]
             {
-                string.Format("@@continua[setVariable name='GitVersion_{0}' value='{1}']", name, value)
+                string.Format("@@continua[setVariable name='GitVersion_{0}' value='{1}' skipIfNotDefined='true']", name, value)
             };
         }