1 files changed, 5 insertions, 1 deletions
diff --git a/crawl-ref/source/tags.cc b/crawl-ref/source/tags.cc
index deebe42670..68fa56440e 100644
--- a/crawl-ref/source/tags.cc
+++ b/crawl-ref/source/tags.cc
@@ -1529,7 +1529,11 @@ static void tag_read_level( struct tagHeader &th, char minorVersion )
             env.map_col[i][j].flags  = unmarshallShort(th);
 
             mgrd[i][j] = NON_MONSTER;
-            env.cgrid[i][j] = unmarshallByte(th);
+            env.cgrid[i][j] = (unsigned char) unmarshallByte(th);
+
+            // Ugh! Backward compatibility. 101 was the old (buggy) EMPTY_CLOUD
+            if (minorVersion < 2 && env.cgrid[i][j] == 101)
+                env.cgrid[i][j] = EMPTY_CLOUD;
         }
     }