diff --git a/Makefile.am b/Makefile.am
index 57fd64c08de8d98a2f75b74d3559c32a6fc2c632..c6a2f84becd7f25ebba0f26abbaa6f7a248f7db2 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -22,7 +22,7 @@ include opus_headers.txt
 
 libopus_la_SOURCES = $(CELT_SOURCES) $(SILK_SOURCES) $(OPUS_SOURCES)
 
-pkginclude_HEADERS = src/opus.h
+pkginclude_HEADERS = src/opus.h src/opus_multistream.h libcelt/opus_types.h
 
 noinst_HEADERS = $(OPUS_HEAD) $(SILK_HEAD) $(CELT_HEAD)