diff --git a/include/Makefile.am b/include/Makefile.am
index 972f403ce..33116f284 100644
--- a/include/Makefile.am
+++ b/include/Makefile.am
@@ -26,6 +26,7 @@ sdk_HEADERS =		\
 	gc.h		\
 	gcstruct.h	\
 	globals.h	\
+	glx_extinit.h	\
 	input.h		\
 	inputstr.h	\
 	list.h		\