diff --git a/lib/Makefile.am b/lib/Makefile.am
index 5bc48ffb..c809c2c4 100644
--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@@ -34,7 +34,9 @@ libuasync_a_SOURCES = \
 	opus_codec.c \
 	opus_codec.h \
 	audio_compressor.c \
-	audio_compressor.h
+	audio_compressor.h \
+	strbuf.c \
+	strbuf.h
 
 libuasync_a_CFLAGS = \
 	-D_ISOC99_SOURCE \