diff --git a/source/blender/alembic/intern/abc_mball.h b/source/blender/alembic/intern/abc_mball.h
index 19bf7dc054d..bae4b6bcb76 100644
--- a/source/blender/alembic/intern/abc_mball.h
+++ b/source/blender/alembic/intern/abc_mball.h
@@ -26,6 +26,7 @@
 #include "abc_object.h"
 
 class AbcMeshWriter;
+struct EvaluationContext;
 struct Main;
 struct MetaBall;
 struct Object;