--- a/mx/mx_graal.py	Fri Dec 05 03:30:19 2014 +0100
+++ b/mx/mx_graal.py	Fri Dec 05 08:20:06 2014 +0100
@@ -755,7 +755,7 @@
         if not exists(opts2.export_dir):
             os.makedirs(opts2.export_dir)
         else:
-            assert os.path.isdir(opts2.export_dir), '{} is not a directory'.format(opts2.export_dir)
+            assert os.path.isdir(opts2.export_dir), '{0} is not a directory'.format(opts2.export_dir)
 
         defsPath = join(_graal_home, 'make', 'defs.make')
         with open(defsPath) as fp:
@@ -1835,7 +1835,7 @@
                         deps = d['deps']
                         makejmhdep(artifactId, groupId, deps)
             except ValueError as e:
-                mx.abort('Error parsing {}:\n{}'.format(f, e))
+                mx.abort('Error parsing {0}:\n{1}'.format(f, e))
 
 def buildjmh(args):
     """build the JMH benchmarks"""
@@ -1916,7 +1916,7 @@
                 else:
                     jmhArgs[n] = v
         except ValueError as e:
-            mx.abort('error parsing JSON input: {}\n{}'.format(j, e))
+            mx.abort('error parsing JSON input: {0}\n{1}'.format(j, e))
 
     jmhPath = _get_jmh_path()
     mx.log('Using benchmarks in ' + jmhPath)
@@ -2310,7 +2310,7 @@
                                         if not matcher.match(content):
                                             failures[f] = csConfig
     for n, v in failures.iteritems():
-        mx.log('{}: header does not match RegexpHeader defined in {}'.format(n, v))
+        mx.log('{0}: header does not match RegexpHeader defined in {0}'.format(n, v))
     return len(failures)
 
 def mx_init(suite):