diff --git a/src/main/java/loci/common/StreamHandle.java b/src/main/java/loci/common/StreamHandle.java
index 5cbc7e59..0dccf50a 100644
--- a/src/main/java/loci/common/StreamHandle.java
+++ b/src/main/java/loci/common/StreamHandle.java
@@ -156,8 +156,10 @@ public void seek(long pos) throws IOException {
     fp = pos;
 
     if (diff < 0) {
+      // resetStream sets the fp to 0
       resetStream();
-      diff = fp;
+      diff = pos;
+      fp = pos;
     }
     int skipped = stream.skipBytes((int) diff);
     while (skipped < diff) {
@@ -165,6 +167,7 @@ public void seek(long pos) throws IOException {
       if (n == 0) break;
       skipped += n;
     }
+    markManager();
   }
 
   /* @see IRandomAccess.write(ByteBuffer) */