diff --git a/python_apps/media-monitor/airtimefilemonitor/mediamonitorcommon.py b/python_apps/media-monitor/airtimefilemonitor/mediamonitorcommon.py
index ea2c4fe79..2852cec45 100644
--- a/python_apps/media-monitor/airtimefilemonitor/mediamonitorcommon.py
+++ b/python_apps/media-monitor/airtimefilemonitor/mediamonitorcommon.py
@@ -298,7 +298,7 @@ def test_file_playability(pathname):
     """
     liquidsoap_found = subprocess.call("which liquidsoap", shell=True)
     if liquidsoap_found == 0:
-        return_code = subprocess.call("liquidsoap -r \"%s\"" % pathname.replace("'", "\\'"), shell=True)
+        return_code = subprocess.call("liquidsoap -r \"%s\"" % pathname.replace('"', '\\"'), shell=True)
     else:
         return_code = 0