diff --git a/components/bsa/bsa_file.cpp b/components/bsa/bsa_file.cpp
index a8604dfe83..8fc2d3f8d9 100644
--- a/components/bsa/bsa_file.cpp
+++ b/components/bsa/bsa_file.cpp
@@ -365,12 +365,14 @@ BsaVersion Bsa::BSAFile::detectVersion(const std::filesystem::path& filePath)
 
     if (head[0] == ESM::fourCC("BTDX"))
     {
-        // head[1] should contains 0x01 it is checked if we want to open this kind of archive
-        if (head[2] == ESM::fourCC("GNRL"))
-            return BSAVER_BA2_GNRL;
-        if (head[2] == ESM::fourCC("DX10"))
-            return BSAVER_BA2_DX10;
-        return BSAVER_UNKNOWN;
+        if (head[1] == static_cast<uint32_t>(0x01))
+        {
+            if (head[2] == ESM::fourCC("GNRL"))
+                return BSAVER_BA2_GNRL;
+            if (head[2] == ESM::fourCC("DX10"))
+                return BSAVER_BA2_DX10;
+        }
+        return BSAVER_COMPRESSED;
     }
 
     return BSAVER_UNKNOWN;