diff --git a/pyfpdb/interlocks.py b/pyfpdb/interlocks.py
old mode 100755
new mode 100644
index c2e6abd6..496c5d0b
--- a/pyfpdb/interlocks.py
+++ b/pyfpdb/interlocks.py
@@ -108,7 +108,7 @@ class InterProcessLockFcntl(InterProcessLockBase):
         self.lockfd = 0
         try:
             os.unlink(self.lock_file_name)
-        except IOError:
+        except OSError:
             # We don't care about the existence of the file too much here.  It's the flock() we care about,
             # And that should just go away magically.
             pass