diff --git a/src/Makefile.sources b/src/Makefile.sources
index 37c83dc9f..6c891eac5 100644
--- a/src/Makefile.sources
+++ b/src/Makefile.sources
@@ -341,6 +341,7 @@ HB_SUBSET_sources = \
 	hb-subset-cff2.hh \
 	hb-subset-input.cc \
 	hb-subset-input.hh \
+	hb-subset-accelerator.hh \
 	hb-subset-plan.cc \
 	hb-subset-plan.hh \
 	hb-subset-repacker.cc \