diff --git a/constants/BUILD.gn b/constants/BUILD.gn
index 1c7cea4..d6cd04a 100644
--- a/constants/BUILD.gn
+++ b/constants/BUILD.gn
@@ -12,6 +12,7 @@
     "annotation_flags.h",
     "appearance.cpp",
     "appearance.h",
+    "ascii.h",
     "form_fields.cpp",
     "form_fields.h",
     "form_flags.h",