diff --git a/Makefile.am b/Makefile.am
index 573868cc..942a9e28 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -163,7 +163,6 @@ dist_tmux_SOURCES = \
 	spawn.c \
 	status.c \
 	style.c \
-	spawn.c \
 	tmux.c \
 	tmux.h \
 	tty-acs.c \