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-rw-r--r--src/openttd.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/openttd.h b/src/openttd.h
index 7a478655a..398469940 100644
--- a/src/openttd.h
+++ b/src/openttd.h
@@ -581,6 +581,7 @@ enum WindowClass {
WC_CONFIRM_POPUP_QUERY,
WC_TRANSPARENCY_TOOLBAR,
WC_VEHICLE_TIMETABLE,
+ WC_BUILD_SIGNAL,
};