diff --git a/ndn-cpp/c/encoding/binary-xml-key.c b/ndn-cpp/c/encoding/binary-xml-key.c
index 4375c6c..5b6de79 100644
--- a/ndn-cpp/c/encoding/binary-xml-key.c
+++ b/ndn-cpp/c/encoding/binary-xml-key.c
@@ -33,7 +33,7 @@
   else
     return NDN_ERROR_unrecognized_ndn_KeyLocatorType;
   
-	if ((error = ndn_BinaryXmlEncoder_writeElementClose(encoder)))
+  if ((error = ndn_BinaryXmlEncoder_writeElementClose(encoder)))
     return error;
   
   return NDN_ERROR_success;