1 files changed, 1 insertions, 0 deletions
diff --git a/Makefile b/Makefile
index debabfffc..f80d708ff 100644
--- a/Makefile
+++ b/Makefile
@@ -735,6 +735,7 @@ SRCS += newgrf.c
 SRCS += newgrf_cargo.c
 SRCS += newgrf_config.c
 SRCS += newgrf_engine.c
+SRCS += newgrf_gui.c
 SRCS += newgrf_sound.c
 SRCS += newgrf_spritegroup.c
 SRCS += newgrf_station.c