diff --git a/src/protocol-detail/probe.hpp b/src/protocol-detail/probe.hpp
index e6ff022..c973c07 100644
--- a/src/protocol-detail/probe.hpp
+++ b/src/protocol-detail/probe.hpp
@@ -46,7 +46,7 @@
   decodeApplicationParameters(const Block& block);
 };
 
-}  // namespace ndncert
-}  // namespace ndn
+} // namespace ndncert
+} // namespace ndn
 
-#endif  // NDNCERT_PROTOCOL_DETAIL_HPP
\ No newline at end of file
+#endif // NDNCERT_PROTOCOL_DETAIL_HPP
\ No newline at end of file