diff --git a/rhizome.h b/rhizome.h
index 6e5aa9ff..91fd46c7 100644
--- a/rhizome.h
+++ b/rhizome.h
@@ -624,8 +624,8 @@ int rhizome_update_file_priority(const char *fileid);
 enum rhizome_bundle_status rhizome_find_duplicate(const rhizome_manifest *m, rhizome_manifest **found);
 int rhizome_manifest_to_bar(rhizome_manifest *m,unsigned char *bar);
 uint64_t rhizome_bar_version(const unsigned char *bar);
-uint64_t rhizome_bar_bidprefix_ll(unsigned char *bar);
-int rhizome_is_bar_interesting(unsigned char *bar);
+uint64_t rhizome_bar_bidprefix_ll(const unsigned char *bar);
+int rhizome_is_bar_interesting(const unsigned char *bar);
 int rhizome_is_manifest_interesting(rhizome_manifest *m);
 int rhizome_retrieve_manifest(const rhizome_bid_t *bid, rhizome_manifest *m);
 int rhizome_retrieve_manifest_by_prefix(const unsigned char *prefix, unsigned prefix_len, rhizome_manifest *m);
diff --git a/rhizome_database.c b/rhizome_database.c
index be5b28e2..9f3da86f 100644
--- a/rhizome_database.c
+++ b/rhizome_database.c
@@ -2089,7 +2089,7 @@ static int is_interesting(const char *id_hex, uint64_t version)
   OUT();
 }
 
-int rhizome_is_bar_interesting(unsigned char *bar)
+int rhizome_is_bar_interesting(const unsigned char *bar)
 {
   uint64_t version = rhizome_bar_version(bar);
   char id_hex[RHIZOME_BAR_PREFIX_BYTES *2 + 2];
diff --git a/rhizome_packetformats.c b/rhizome_packetformats.c
index e0570cd9..c7c9e716 100644
--- a/rhizome_packetformats.c
+++ b/rhizome_packetformats.c
@@ -129,7 +129,7 @@ uint64_t rhizome_bar_version(const unsigned char *bar)
 
 /* This function only displays the first 8 bytes, and should not be used
    for comparison. */
-uint64_t rhizome_bar_bidprefix_ll(unsigned char *bar)
+uint64_t rhizome_bar_bidprefix_ll(const unsigned char *bar)
 {
   uint64_t bidprefix=0;
   int i;
diff --git a/rhizome_sync.c b/rhizome_sync.c
index fbf723b6..24dcd46a 100644
--- a/rhizome_sync.c
+++ b/rhizome_sync.c
@@ -388,7 +388,8 @@ static void sync_send_response(struct subscriber *dest, int forwards, uint64_t t
 
     if (rowid>max_token){
       // a new bundle has been imported
-      rhizome_sync_bundle_inserted(bar);
+      if (!rhizome_is_bar_interesting(bar))
+	rhizome_sync_bundle_inserted(bar);
     }
 
     if (count < max_count){