diff --git a/os/windows/installer/install.nsi b/os/windows/installer/install.nsi
index 4dc431029c..6fc1df4685 100644
--- a/os/windows/installer/install.nsi
+++ b/os/windows/installer/install.nsi
@@ -3,6 +3,7 @@
 !define APPV_MINOR 2
 !define APPV_MAINT 0
 !define APPV_BUILD 8
+!define APPV_EXTRA ""
 
 !define APPNAME "OpenTTD"   ; Define application name
 !define APPVERSION "${APPV_MAJOR}.${APPV_MINOR}.${APPV_MAINT}${APPV_EXTRA}"  ; Define application version