diff --git a/libisofs/fs_image.c b/libisofs/fs_image.c
index b959233..15ec540 100644
--- a/libisofs/fs_image.c
+++ b/libisofs/fs_image.c
@@ -1582,7 +1582,7 @@ int iso_file_source_new_ifs(IsoImageFilesystem *fs, IsoFileSource *parent,
             {ret = ISO_OUT_OF_MEM; goto ex;}
         }
 
-        while ((ret = susp_iter_next(iter, &sue)) > 0) {
+        while ((ret = susp_iter_next(iter, &sue, 0)) > 0) {
 
             /* ignore entries from different version */
             if (sue->version[0] != 1)
@@ -2398,7 +2398,7 @@ int read_root_susp_entries(_ImageFsData *data, uint32_t block)
     }
 
     /* first entry must be an SP system use entry */
-    ret = susp_iter_next(iter, &sue);
+    ret = susp_iter_next(iter, &sue, 1);
     if (ret < 0) {
         /* error */
         susp_iter_free(iter);
@@ -2442,7 +2442,7 @@ int read_root_susp_entries(_ImageFsData *data, uint32_t block)
      * no?), but if we finally need it, it can be easily implemented in
      * the iterator, transparently for the rest of the code.
      */
-    while ((ret = susp_iter_next(iter, &sue)) > 0) {
+    while ((ret = susp_iter_next(iter, &sue, 0)) > 0) {
 
         /* ignore entries from different version */
         if (sue->version[0] != 1)
diff --git a/libisofs/rockridge.h b/libisofs/rockridge.h
index 887e950..88eed0a 100644
--- a/libisofs/rockridge.h
+++ b/libisofs/rockridge.h
@@ -266,7 +266,8 @@ susp_iter_new(IsoDataSource *src, struct ecma119_dir_record *record,
  * @return
  *      1 on success, 0 if no more entries, < 0 error
  */
-int susp_iter_next(SuspIterator *iter, struct susp_sys_user_entry **sue);
+int susp_iter_next(SuspIterator *iter, struct susp_sys_user_entry **sue,
+                   int flag);
 
 /**
  * Free a given susp iterator.
diff --git a/libisofs/rockridge_read.c b/libisofs/rockridge_read.c
index b44c61d..4dbc78a 100644
--- a/libisofs/rockridge_read.c
+++ b/libisofs/rockridge_read.c
@@ -67,12 +67,26 @@ susp_iter_new(IsoDataSource *src, struct ecma119_dir_record *record,
     return iter;
 }
 
-int susp_iter_next(SuspIterator *iter, struct susp_sys_user_entry **sue)
+/* @param flag bit0 = First call on root:
+                      Not yet clear whether this is SUSP at all
+*/
+int susp_iter_next(SuspIterator *iter, struct susp_sys_user_entry **sue,
+                   int flag)
 {
     struct susp_sys_user_entry *entry;
 
     entry = (struct susp_sys_user_entry*)(iter->base + iter->pos);
 
+    if (flag & 1) {
+        /* Yet unclear whether it is SUSP at all */
+        if (iter->size < 7)
+            return 0;
+        if (!SUSP_SIG(entry, 'S', 'P'))
+            return 0;
+        if (entry->len_sue[0] < 7)
+            return 0;
+        /* Looks like SUSP enough to pass the further processing here. */
+    }
     if ( (iter->pos + 4 > iter->size) || (SUSP_SIG(entry, 'S', 'T'))) {
 
         /* 
@@ -134,10 +148,10 @@ int susp_iter_next(SuspIterator *iter, struct susp_sys_user_entry **sue)
         }
 
         /* we don't want to return CE entry to the user */
-        return susp_iter_next(iter, sue);
+        return susp_iter_next(iter, sue, 0);
     } else if (SUSP_SIG(entry, 'P', 'D')) {
         /* skip padding */
-        return susp_iter_next(iter, sue);
+        return susp_iter_next(iter, sue, 0);
     }
 
     *sue = entry;