diff --git a/src/hb-number.cc b/src/hb-number.cc
index 6ae966288..424c2a3ff 100644
--- a/src/hb-number.cc
+++ b/src/hb-number.cc
@@ -26,6 +26,7 @@
 #include "hb.hh"
 #include "hb-machinery.hh"
 #include "hb-number.hh"
+#include "hb-number-parser.hh"
 
 #include <locale.h>
 #ifdef HAVE_XLOCALE_H