diff --git a/Makefile.am b/Makefile.am
index eb08990a..68494932 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -181,6 +181,7 @@ dist_tmux_SOURCES = \
 	style.c \
 	tmux.c \
 	tmux.h \
+	tmux-protocol.h \
 	tty-acs.c \
 	tty-features.c \
 	tty-keys.c \