diff --git a/panda/src/display/graphicsStateGuardian.h b/panda/src/display/graphicsStateGuardian.h
index bfc709381c..179c01a33e 100644
--- a/panda/src/display/graphicsStateGuardian.h
+++ b/panda/src/display/graphicsStateGuardian.h
@@ -41,6 +41,7 @@
 #include "colorWriteAttrib.h"
 #include "colorBlendAttrib.h"
 #include "textureAttrib.h"
+#include "texGenAttrib.h"
 #include "materialAttrib.h"
 #include "lightAttrib.h"
 #include "transparencyAttrib.h"