diff --git a/prometheus_client/process_collector.py b/prometheus_client/process_collector.py
index 292a3150..8893959d 100644
--- a/prometheus_client/process_collector.py
+++ b/prometheus_client/process_collector.py
@@ -30,7 +30,7 @@ def __init__(self, namespace='', pid=lambda: 'self', proc='/proc', registry=REGI
         self._ticks = 100.0
         try:
             self._ticks = os.sysconf('SC_CLK_TCK')
-        except (ValueError, TypeError, AttributeError):
+        except (ValueError, TypeError, AttributeError, OSError):
             pass
 
         # This is used to test if we can access /proc.