diff --git a/epsilon/scripts/benchmark.py b/epsilon/scripts/benchmark.py
index 708a369..ae5f4aa 100644
--- a/epsilon/scripts/benchmark.py
+++ b/epsilon/scripts/benchmark.py
@@ -423,7 +423,7 @@ def discoverCurrentWorkingDevice():
     """
     possibilities = []
     cwd = os.getcwd()
-    for L in file('/etc/mtab'):
+    for L in file('/proc/self/mounts'):
         parts = L.split()
         if cwd.startswith(parts[1]):
             possibilities.append((len(parts[1]), parts[0]))
diff --git a/epsilon/test/test_benchmark.py b/epsilon/test/test_benchmark.py
index 6b41b79..c938822 100644
--- a/epsilon/test/test_benchmark.py
+++ b/epsilon/test/test_benchmark.py
@@ -16,16 +16,17 @@
 
 try:
     filepath.FilePath('/proc/diskstats').open().close()
+    filepath.FilePath('/proc/self/mounts').open().close()
 except IOError:
-    hasDiskstats = False
+    hasProc = False
 else:
-    hasDiskstats = True
+    hasProc = True
 
 
 
 class DiskstatTestCase(unittest.TestCase):
-    if not hasDiskstats:
-        skip = 'epsilon.benchmark requires access to /proc/diskstats'
+    if not hasProc:
+        skip = 'epsilon.benchmark requires access to /proc'
 
 
     def testDiskLineParser(self):
@@ -406,8 +407,8 @@ def cbKilled(exc):
 
 
 class SnapshotTestCase(unittest.TestCase):
-    if not hasDiskstats:
-        skip = 'epsilon.benchmark requires access to /proc/diskstats'
+    if not hasProc:
+        skip = 'epsilon.benchmark requires access to /proc'
 
 
     def testStart(self):
@@ -424,8 +425,8 @@ def testStop(self):
 
 
 class BenchmarkProcessTestCase(SpawnMixin, unittest.TestCase):
-    if not hasDiskstats:
-        skip = 'epsilon.benchmark requires access to /proc/diskstats'
+    if not hasProc:
+        skip = 'epsilon.benchmark requires access to /proc'
 
 
     processProtocol = benchmark.BenchmarkProcess