diff --git a/lib/hx509/Makefile.am b/lib/hx509/Makefile.am
index 470047758..214dabf0e 100644
--- a/lib/hx509/Makefile.am
+++ b/lib/hx509/Makefile.am
@@ -50,6 +50,7 @@ dist_libhx509_la_SOURCES = \
 
 dist_libhx509template_la_SOURCES = $(dist_libhx509_la_SOURCES)
 
+sel-gram.h: sel-gram.c
 sel-lex.c: sel-gram.h
 
 libhx509_la_DEPENDENCIES = version-script.map