diff --git a/Sources/MapLibreSwiftDSL/Style Layers/Line.swift b/Sources/MapLibreSwiftDSL/Style Layers/Line.swift
index 5286c8d..dd30625 100644
--- a/Sources/MapLibreSwiftDSL/Style Layers/Line.swift	
+++ b/Sources/MapLibreSwiftDSL/Style Layers/Line.swift	
@@ -78,6 +78,7 @@ private struct LineStyleLayerInternal: StyleLayer {
         result.lineJoin = definition.lineJoin
         result.lineDashPattern = definition.lineDashPattern
         result.predicate = definition.predicate
+        result.sourceLayerIdentifier = definition.sourceLayerIdentifier
 
         return result
     }