diff --git a/frappy_psi/softcal.py b/frappy_psi/softcal.py
index 81c035e5..816ab82d 100644
--- a/frappy_psi/softcal.py
+++ b/frappy_psi/softcal.py
@@ -113,7 +113,7 @@ class CalCurve:
         calibname = sensopt.pop(0)
         _, dot, ext = basename(calibname).rpartition('.')
         kind = None
-        pathlist = os.environ.get('FRAPPY_CALIB_PATH', '').replace(',' ' ').split(' ')
+        pathlist = os.environ.get('FRAPPY_CALIB_PATH', '').replace(',', ' ').split(' ')
         pathlist.append(join(dirname(__file__), 'calcurves'))
         for path in pathlist:
             # first try without adding kind
@@ -296,4 +296,3 @@ class Function(Readable):
     @nopoll
     def read_status(self):
         return self._get_status(self.rawsensor.read_status())
-    
\ No newline at end of file