diff --git a/tool/CommandRegRead.cpp b/tool/CommandRegRead.cpp
index dbc83a54..c61339fd 100644
--- a/tool/CommandRegRead.cpp
+++ b/tool/CommandRegRead.cpp
@@ -189,7 +189,7 @@ void CommandRegRead::execute(MasterDevice &m, const StringVector &args)
         cout << uval << " 0x" << hex << setw(8) << uval << endl;
     } else if (dataType->name == "uint64") {
         long long unsigned int uval = le64_to_cpup(data.data);
-        cout << uval << " 0x" << hex << setw(8) << uval << endl;
+        cout << uval << " 0x" << hex << setw(16) << uval << endl;
     } else { // raw
         uint8_t *d = data.data;
         unsigned int size = data.length;