diff --git a/ndn-cpp/encoding/binary-xml-decoder.hpp b/ndn-cpp/encoding/binary-xml-decoder.hpp
index d4304b0..ae04831 100644
--- a/ndn-cpp/encoding/binary-xml-decoder.hpp
+++ b/ndn-cpp/encoding/binary-xml-decoder.hpp
@@ -36,7 +36,7 @@
   {
     int gotExpectedTag;
     ndn_Error error;
-    if (error = ndn_BinaryXmlDecoder_peekDTag(this, expectedTag, &gotExpectedTag))
+    if ((error = ndn_BinaryXmlDecoder_peekDTag(this, expectedTag, &gotExpectedTag)))
       throw std::runtime_error(ndn_getErrorString(error));
     
     return gotExpectedTag;