diff --git a/epan/dissectors/packet-dnp.c b/epan/dissectors/packet-dnp.c
index 3f78aaee03..c07ae24180 100644
--- a/epan/dissectors/packet-dnp.c
+++ b/epan/dissectors/packet-dnp.c
@@ -3455,6 +3455,7 @@ dissect_dnp3_message(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void*
     else
     {
       /* CRC error - throw away the data. */
+      g_free(al_buffer);
       next_tvb = NULL;
     }
   }