diff --git a/src/engine_type.h b/src/engine_type.h
index 9715f65ec7..41df86276d 100644
--- a/src/engine_type.h
+++ b/src/engine_type.h
@@ -191,8 +191,8 @@ struct EngineInfo {
  * Engine.flags is a bitmask, with the following values.
  */
 enum class EngineFlag : uint8_t {
-	Available        = 1, ///< This vehicle is available to everyone.
-	ExclusivePreview = 2, ///< This vehicle is in the exclusive preview stage, either being used or being offered to a company.
+	Available        = 0, ///< This vehicle is available to everyone.
+	ExclusivePreview = 1, ///< This vehicle is in the exclusive preview stage, either being used or being offered to a company.
 };
 using EngineFlags = EnumBitSet<EngineFlag, uint8_t>;
 
diff --git a/src/saveload/engine_sl.cpp b/src/saveload/engine_sl.cpp
index 695f5ada57..3c7e07fa36 100644
--- a/src/saveload/engine_sl.cpp
+++ b/src/saveload/engine_sl.cpp
@@ -82,7 +82,7 @@ struct ENGNChunkHandler : ChunkHandler {
 			if (IsSavegameVersionBefore(SLV_179)) {
 				/* preview_company_rank was replaced with preview_company and preview_asked.
 				 * Just cancel any previews. */
-				e->flags.Reset(EngineFlag{4}); // ENGINE_OFFER_WINDOW_OPEN
+				e->flags.Reset(EngineFlag{2}); // ENGINE_OFFER_WINDOW_OPEN
 				e->preview_company = CompanyID::Invalid();
 				e->preview_asked.Set();
 			}