diff --git a/aegisub/packages/win_installer/aegisub3_64.iss b/aegisub/packages/win_installer/aegisub3_64.iss
new file mode 100644
index 000000000..7231f670a
--- /dev/null
+++ b/aegisub/packages/win_installer/aegisub3_64.iss
@@ -0,0 +1,4 @@
+#define ARCH64
+#define ARCH 64
+
+#include "aegisub3.iss"