diff --git a/src/Makefile.am b/src/Makefile.am
index c47a1a5..4908876 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -47,6 +47,7 @@
 	hb-ot-layout-gsubgpos-private.hh \
 	hb-ot-layout-gsub-private.hh \
 	hb-ot-layout-private.hh \
+	hb-ot-map.cc \
 	hb-ot-map-private.hh \
 	hb-ot-shape.cc \
 	hb-ot-shape-private.hh \