diff --git a/launch.go b/launch.go
index 96a8e14..ae557ac 100644
--- a/launch.go
+++ b/launch.go
@@ -310,7 +310,17 @@ func SetExternalMeta(api screwdriver.API, pipelineID, parentBuildID int, mergedM
 			externalMetaFile := "sd@" + strconv.Itoa(parentJob.PipelineID) + ":" + parentJob.Name + ".json"
 			writeMetafile(metaSpace, externalMetaFile, metaLog, parentBuild.Meta)
 			if join {
-				resultMeta = deepMergeJSON(resultMeta, parentBuild.Meta)
+				marshallValue, err := json.Marshal(parentBuild.Meta)
+				if err != nil {
+					return resultMeta, fmt.Errorf("Cloning meta of Parent Build ID %d: %v", parentBuildID, err)
+				}
+				var externalParentBuildMeta map[string]interface{}
+				json.Unmarshal(marshallValue, &externalParentBuildMeta)
+
+				// Always exclude parameters from external meta
+				delete(externalParentBuildMeta, "parameters")
+
+				resultMeta = deepMergeJSON(resultMeta, externalParentBuildMeta)
 			}
 
 			// delete local version of external meta