diff --git a/libwebm/mkvparser/mkvparser.cc b/libwebm/mkvparser/mkvparser.cc
index 70c1f04..87adef3 100644
--- a/libwebm/mkvparser/mkvparser.cc
+++ b/libwebm/mkvparser/mkvparser.cc
@@ -4328,6 +4328,12 @@
         return status;
       }
 
+      // There should be only one settings element per content compression.
+      if (compression->settings != NULL) {
+        delete[] buf;
+        return E_FILE_FORMAT_INVALID;
+      }
+
       compression->settings = buf;
       compression->settings_len = buflen;
     }