diff --git a/client/Makefile.am b/client/Makefile.am
index d5ec4dedc0..9fdb292088 100644
--- a/client/Makefile.am
+++ b/client/Makefile.am
@@ -24,6 +24,7 @@ boinc_client_SOURCES =				\
     hostinfo_unix.C				\
     http.C					\
     log_flags.C					\
+    message.C					\
     net_stats.C					\
     net_xfer.C					\
     pers_file_xfer.C				\