diff --git a/nzbtomedia/nzbToMediaUtil.py b/nzbtomedia/nzbToMediaUtil.py
index bbc1c278..36efe248 100644
--- a/nzbtomedia/nzbToMediaUtil.py
+++ b/nzbtomedia/nzbToMediaUtil.py
@@ -1043,7 +1043,7 @@ class RunningProcess():
 class WindowsProcess():
 
     def __init__(self):
-        self.mutexname = "nzbtomedia_" + nzbtomedia.PID_FILE  # {D0E858DF-985E-4907-B7FB-8D732C3FC3B9}"
+        self.mutexname = "nzbtomedia_" + nzbtomedia.PID_FILE.replace('\\','/')  # {D0E858DF-985E-4907-B7FB-8D732C3FC3B9}"
         if platform.system() == 'Windows':
             from win32event import CreateMutex
             from win32api import CloseHandle, GetLastError