diff --git a/thermion_dart/native/include/c_api/APIBoundaryTypes.h b/thermion_dart/native/include/c_api/APIBoundaryTypes.h
index 70e91863..2eb95301 100644
--- a/thermion_dart/native/include/c_api/APIBoundaryTypes.h
+++ b/thermion_dart/native/include/c_api/APIBoundaryTypes.h
@@ -47,7 +47,8 @@ extern "C"
 	typedef struct TFilamentAsset TFilamentAsset;
 	typedef struct TColorGrading TColorGrading;
 	typedef struct TKtx1Bundle TKtx1Bundle;
-
+	typedef struct TOverlayManager TOverlayManager;
+	
 	typedef struct { 
 		double x;
 		double y;