diff --git a/src/util/Makefile.sources b/src/util/Makefile.sources
index edc3364..ac41e0c 100644
--- a/src/util/Makefile.sources
+++ b/src/util/Makefile.sources
@@ -59,6 +59,8 @@
 	log.c \
 	log.h \
 	macros.h \
+	memstream.c \
+	memstream.h \
 	mesa-sha1.c \
 	mesa-sha1.h \
 	os_time.c \