diff --git a/pandatool/src/stitchviewer/stitchImageVisualizer.cxx b/pandatool/src/stitchviewer/stitchImageVisualizer.cxx
index 1b5e21eafc..2011c130af 100644
--- a/pandatool/src/stitchviewer/stitchImageVisualizer.cxx
+++ b/pandatool/src/stitchviewer/stitchImageVisualizer.cxx
@@ -24,6 +24,7 @@
 #include <cullFaceAttribute.h>
 #include <clockObject.h>
 #include <config_gobj.h>
+#include <allAttributesWrapper.h>
 
 #include <algorithm>