diff --git a/xcomreader.cpp b/xcomreader.cpp
index 2e47b65..9deef6e 100644
--- a/xcomreader.cpp
+++ b/xcomreader.cpp
@@ -654,6 +654,7 @@ namespace xcom
     {
         switch (version)
         {
+            case xcom_version::enemy_unknown:
             case xcom_version::enemy_within:
             {
                 lzo_init();