diff --git a/src/vplaintextedit.h b/src/vplaintextedit.h
index 11a32d71..143784a3 100644
--- a/src/vplaintextedit.h
+++ b/src/vplaintextedit.h
@@ -12,6 +12,7 @@ class VImageResourceManager;
 class QPaintEvent;
 class QPainter;
 class QResizeEvent;
+class VPlainTextDocumentLayout;
 
 
 struct VBlockImageInfo