portability fixes

diff --git a/libasn1fix/asn1fix_constraint_compat.c b/libasn1fix/asn1fix_constraint_compat.c
index effa0ad..5eb93f0 100644
--- a/libasn1fix/asn1fix_constraint_compat.c
+++ b/libasn1fix/asn1fix_constraint_compat.c
@@ -1,5 +1,5 @@
-#include <asn1fix_internal.h>
-#include <asn1fix_crange.h>
+#include "asn1fix_internal.h"
+#include "asn1fix_crange.h"
 
 /*
  * Check that a specific constraint is compatible