diff --git a/similar/main/gamesave.cpp b/similar/main/gamesave.cpp
index e6baf4ad3..70e5fd58e 100644
--- a/similar/main/gamesave.cpp
+++ b/similar/main/gamesave.cpp
@@ -178,6 +178,8 @@ static int convert_wclip(int wc) {
 }
 int convert_tmap(int tmap)
 {
+	if (tmap == -1)
+		return tmap;
     return (tmap >= NumTextures) ? tmap % NumTextures : tmap;
 }
 static int convert_polymod(int polymod) {