2 files changed, 3 insertions, 3 deletions
diff --git a/src/mem/ruby/common/SConscript b/src/mem/ruby/common/SConscript
index a19268cba..b97391c0a 100644
--- a/src/mem/ruby/common/SConscript
+++ b/src/mem/ruby/common/SConscript
@@ -33,6 +33,8 @@ Import('*')
 if env['PROTOCOL'] == 'None':
     Return()
 
+env.Append(CPPDEFINES={'NUMBER_BITS_PER_SET': env['NUMBER_BITS_PER_SET']})
+
 Source('Address.cc')
 Source('BoolVec.cc')
 Source('Consumer.cc')
diff --git a/src/mem/ruby/common/Set.hh b/src/mem/ruby/common/Set.hh
index cb01c9613..aba38f51e 100644
--- a/src/mem/ruby/common/Set.hh
+++ b/src/mem/ruby/common/Set.hh
@@ -39,13 +39,11 @@
 #include "base/logging.hh"
 #include "mem/ruby/common/TypeDefines.hh"
 
-// Change for systems with more than 64 controllers of a particular type.
-const int NUMBER_BITS_PER_SET = 64;
-
 class Set
 {
   private:
     // Number of bits in use in this set.
+    // can be defined in build_opts file (default=64).
     int m_nSize;
     std::bitset<NUMBER_BITS_PER_SET> bits;