diff --git a/src/crypto-support/crypto-helper.hpp b/src/crypto-support/crypto-helper.hpp
index 4381977..53f57f1 100644
--- a/src/crypto-support/crypto-helper.hpp
+++ b/src/crypto-support/crypto-helper.hpp
@@ -26,12 +26,12 @@
 
 #include "certificate-request.hpp"
 
-static const int INFO_LEN = 10;
-static const uint8_t INFO[] = {0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9};
-
 namespace ndn {
 namespace ndncert {
 
+static const int INFO_LEN = 10;
+static const uint8_t INFO[] = {0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9};
+
 struct ECDH_CTX {
   int EC_NID;
   EVP_PKEY_CTX* ctx_params;