diff --git a/ndn-cpp/encoding/binary-xml-structure-decoder.hpp b/ndn-cpp/encoding/binary-xml-structure-decoder.hpp
index 331f3d3..e83dd5b 100644
--- a/ndn-cpp/encoding/binary-xml-structure-decoder.hpp
+++ b/ndn-cpp/encoding/binary-xml-structure-decoder.hpp
@@ -32,7 +32,7 @@
   bool findElementEnd(unsigned char *input, unsigned int inputLength) 
   {
     ndn_Error error;
-    if (error = ndn_BinaryXmlStructureDecoder_findElementEnd(this, input, inputLength))
+    if ((error = ndn_BinaryXmlStructureDecoder_findElementEnd(this, input, inputLength)))
       throw std::runtime_error(ndn_getErrorString(error));
     return gotElementEnd();
   }