diff --git a/editor/src/main/kotlin/com/bartlomiejpluta/base/editor/project/serial/ProtobufProjectSerializer.kt b/editor/src/main/kotlin/com/bartlomiejpluta/base/editor/project/serial/ProtobufProjectSerializer.kt
index 76e92df7..e3f15486 100644
--- a/editor/src/main/kotlin/com/bartlomiejpluta/base/editor/project/serial/ProtobufProjectSerializer.kt
+++ b/editor/src/main/kotlin/com/bartlomiejpluta/base/editor/project/serial/ProtobufProjectSerializer.kt
@@ -63,6 +63,7 @@ class ProtobufProjectSerializer : ProjectSerializer {
 
    private fun serializeWidget(widget: WidgetAsset) = ProjectProto.WidgetAsset.newBuilder()
       .setUid(widget.uid)
+      .setSource(widget.source)
       .setName(widget.name)
       .build()
 }
diff --git a/proto/src/main/proto/project.proto b/proto/src/main/proto/project.proto
index 872de5d2..b215a8db 100644
--- a/proto/src/main/proto/project.proto
+++ b/proto/src/main/proto/project.proto
@@ -50,5 +50,6 @@ message FontAsset {
 
 message WidgetAsset {
   required string uid = 1;
+  required string source = 2;
   required string name = 3;
 }
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