diff --git a/farms/disc.py b/farms/disc.py
index c086878..b3d0e71 100644
--- a/farms/disc.py
+++ b/farms/disc.py
@@ -16,7 +16,7 @@
 from farms import SOLAR_CONSTANT
 
 
-def disc(ghi, sza, doy, pressure=101325, sza_lim=87):
+def disc(ghi, sza, doy, pressure=1013.25, sza_lim=87):
     """Estimate DNI from GHI using the DISC model.
 
     *Warning: should only be used for cloudy FARMS data.