diff --git a/src/Boggle.h b/src/Boggle.h
index 2f363f0..36c98a8 100755
--- a/src/Boggle.h
+++ b/src/Boggle.h
@@ -14,6 +14,9 @@
 #include <string>
 #include "lexicon.h"
 
+static const int NUM_ROLLED_CUBES = 4;
+
+
 class Boggle {
 public:
     static const std::string DICTIONARY_FILE;
@@ -26,7 +29,7 @@ public:
     bool isWordPlayed(const std::string &word) const;
 private:
     std::vector<std::string> m_playedWords;
-    std::array<std::string, 4> m_showingSides;
+    std::array<std::string, NUM_ROLLED_CUBES> m_showingSides;
     Lexicon m_englishWords;
 };