diff --git a/SConstruct b/SConstruct
index 38fbe8d4c..062df47d6 100644
--- a/SConstruct
+++ b/SConstruct
@@ -346,6 +346,7 @@ try:
             env.Append(CFLAGS='-arch x86_64')
             env.Append(LINKFLAGS='-arch x86_64')
             env.Append(ASFLAGS='-arch x86_64')
+            env['OSX64bit'] = True
 except:
     pass
 
diff --git a/ext/libelf/SConscript b/ext/libelf/SConscript
index 99c5a4f99..3d35b0c07 100644
--- a/ext/libelf/SConscript
+++ b/ext/libelf/SConscript
@@ -88,11 +88,16 @@ ElfFile('libelf_fsize.c')
 ElfFile('libelf_msize.c')
 
 m4env = Environment(ENV=os.environ)
+
 if env.get('CC'):
     m4env['CC'] = env['CC']
 if env.get('CXX'):
     m4env['CXX'] = env['CXX']
 
+if env.get('OSX64bit'):
+    m4env.Append(CFLAGS='-arch x86_64')
+    m4env.Append(LINKFLAGS='-arch x86_64')
+
 # If we have gm4 use it
 if m4env.Detect('gm4'):
     m4env['M4'] = 'gm4'