diff --git a/src/core/CommandMap.cc b/src/core/CommandMap.cc
index 420a94e..4552f2e 100644
--- a/src/core/CommandMap.cc
+++ b/src/core/CommandMap.cc
@@ -5,13 +5,27 @@
 void CommandMap::add(const char * s, uint32_t id,
         std::shared_ptr<CommandMap> next_map, bool following_char)
 {
-    Node * node = &m_root_node;
     size_t length = strlen(s);
+    if (length < 1u)
+        return;
+    std::vector<uint32_t> v(length);
+    for (size_t i = 0u; i < length; i++)
+    {
+        v[i] = s[i];
+    }
+    add(v, id, next_map, following_char);
+}
+
+void CommandMap::add(const std::vector<uint32_t> & s, uint32_t id,
+        std::shared_ptr<CommandMap> next_map, bool following_char)
+{
+    Node * node = &m_root_node;
+    size_t length = s.size();
     if (length < 1u)
         return;
     for (size_t i = 0u; i < length; i++)
     {
-        uint32_t c = (uint32_t)s[i];
+        const uint32_t c = s[i];
         auto it = node->next_chars.find(c);
         if (it != node->next_chars.end())
         {
diff --git a/src/core/CommandMap.h b/src/core/CommandMap.h
index e17b1fb..8a03a02 100644
--- a/src/core/CommandMap.h
+++ b/src/core/CommandMap.h
@@ -4,6 +4,7 @@
 #include <unordered_map>
 #include <memory>
 #include <list>
+#include <vector>
 #include "Command.h"
 
 class CommandMap
@@ -18,6 +19,8 @@ public:
 
     void add(const char * s, uint32_t id, std::shared_ptr<CommandMap> next_map,
             bool following_char);
+    void add(const std::vector<uint32_t> & s, uint32_t id,
+            std::shared_ptr<CommandMap> next_map, bool following_char);
     uint8_t lookup_command(const uint32_t * command_characters, size_t length,
             Command & command) const;