1 files changed, 5 insertions, 2 deletions

diff --git a/src/block/plugin_block_fs.c b/src/block/plugin_block_fs.c
index a5219b706..3ad15a0c6 100644
--- a/src/block/plugin_block_fs.c
+++ b/src/block/plugin_block_fs.c
@@ -120,8 +120,11 @@ block_plugin_fs_evaluate (void *cls,
       if (reply_block == NULL)
         return GNUNET_BLOCK_EVALUATION_REQUEST_VALID;
       nsid = xquery;
-      if (reply_block_size < sizeof (struct NBlock))
-        return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
+      if (reply_block_size < sizeof (struct SBlock))
+        {
+          GNUNET_break_op (0);
+          return GNUNET_BLOCK_EVALUATION_RESULT_INVALID;
+        }
       sb = reply_block;
       GNUNET_CRYPTO_hash (&sb->subspace,
                           sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),