diff --git a/src/mem/ruby/structures/DirectoryMemory.cc b/src/mem/ruby/structures/DirectoryMemory.cc
index b840349e1..82388a895 100644
--- a/src/mem/ruby/structures/DirectoryMemory.cc
+++ b/src/mem/ruby/structures/DirectoryMemory.cc
@@ -37,7 +37,6 @@ using namespace std;
 
 int DirectoryMemory::m_num_directories = 0;
 int DirectoryMemory::m_num_directories_bits = 0;
-uint64_t DirectoryMemory::m_total_size_bytes = 0;
 int DirectoryMemory::m_numa_high_bit = 0;
 
 DirectoryMemory::DirectoryMemory(const Params *p)
@@ -60,7 +59,6 @@ DirectoryMemory::init()
 
     m_num_directories++;
     m_num_directories_bits = ceilLog2(m_num_directories);
-    m_total_size_bytes += m_size_bytes;
 
     if (m_numa_high_bit == 0) {
         m_numa_high_bit = RubySystem::getMemorySizeBits() - 1;
diff --git a/src/mem/ruby/structures/DirectoryMemory.hh b/src/mem/ruby/structures/DirectoryMemory.hh
index a549366d0..98403808b 100644
--- a/src/mem/ruby/structures/DirectoryMemory.hh
+++ b/src/mem/ruby/structures/DirectoryMemory.hh
@@ -76,7 +76,6 @@ class DirectoryMemory : public SimObject
 
     static int m_num_directories;
     static int m_num_directories_bits;
-    static uint64_t m_total_size_bytes;
     static int m_numa_high_bit;
 };