1 files changed, 2 insertions, 2 deletions
diff --git a/src/Signature.cpp b/src/Signature.cpp
index 9f44ad2..af04017 100644
--- a/src/Signature.cpp
+++ b/src/Signature.cpp
@@ -10,7 +10,7 @@ namespace odhtdb
 {
     namespace Signature
     {
-        PublicKey PublicKey::ZERO("\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0", PUBLIC_KEY_NUM_BYTES);
+        const PublicKey PublicKey::ZERO("\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0", PUBLIC_KEY_NUM_BYTES);
         
         PublicKey::PublicKey(const char *_data, size_t size)
         {
@@ -64,7 +64,7 @@ namespace odhtdb
             return bin2hex(data, PUBLIC_KEY_NUM_BYTES);
         }
         
-        PrivateKey PrivateKey::ZERO("\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0", PRIVATE_KEY_NUM_BYTES);
+        const PrivateKey PrivateKey::ZERO("\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0", PRIVATE_KEY_NUM_BYTES);
         
         PrivateKey::PrivateKey(const char *_data, size_t size)
         {