1 files changed, 1 insertions, 0 deletions
diff --git a/Makefile b/Makefile
index 8e98f1c88..8d20ada64 100644
--- a/Makefile
+++ b/Makefile
@@ -613,6 +613,7 @@ C_SOURCES += settings.c
 C_SOURCES += settings_gui.c
 C_SOURCES += ship_cmd.c
 C_SOURCES += ship_gui.c
+C_SOURCES += signs.c
 C_SOURCES += smallmap_gui.c
 C_SOURCES += sound.c
 C_SOURCES += sprite.c