1 files changed, 4 insertions, 3 deletions

diff --git a/src/main/extractor_datasource.c b/src/main/extractor_datasource.c
index f15321f..d25cc5b 100644
--- a/src/main/extractor_datasource.c
+++ b/src/main/extractor_datasource.c
@@ -321,6 +321,7 @@ bfds_seek (struct BufferedFileDataSource *bfds,
            int64_t pos, int whence)
 {
   uint64_t npos;
+  size_t nbpos;
 
   switch (whence)
     {
@@ -334,11 +335,11 @@ bfds_seek (struct BufferedFileDataSource *bfds,
                (unsigned long long) bfds->fsize);
           return -1;
         }
+      nbpos = bfds->buffer_pos + pos;
       if ( (NULL == bfds->buffer) ||
-           ( (bfds->buffer_pos + pos < bfds->buffer_bytes) &&
-             (bfds->buffer_pos + pos >= 0) ) )
+           (nbpos < bfds->buffer_bytes) )
         {
-          bfds->buffer_pos += pos; 
+          bfds->buffer_pos = nbpos; 
           return npos;
         }
       if (0 != bfds_pick_next_buffer_at (bfds,