diff --git a/os/win32/installer/install.nsi b/os/win32/installer/install.nsi
index e1340e8039..abaf2a75da 100644
--- a/os/win32/installer/install.nsi
+++ b/os/win32/installer/install.nsi
@@ -2,7 +2,7 @@
 !define APPNAME "OpenTTD"
 !define APPNAMEANDVERSION "OpenTTD 0.3.4.0"
 !define APPVERSION "0.3.4.0"
-!define INSTALLERVERSION 11
+!define INSTALLERVERSION 12 ;NEED TO UPDATE THIS FOR EVERY RELEASE!!!
 
 BrandingText "OpenTTD Installer"