diff --git a/AirSeaFluxCode.py b/AirSeaFluxCode.py
index dcd76a07c6545d36b9477e64115d8526855e205f..76c05f00b8daad291cc9128f19f45fb659d55959 100644
--- a/AirSeaFluxCode.py
+++ b/AirSeaFluxCode.py
@@ -429,7 +429,7 @@ def AirSeaFluxCode(spd, T, SST, lat=None, hum=None, P=None, hin=18, hout=10,
                              flag))
     flag = np.where(((Rb < -0.5) | (Rb > 0.2)) & (flag == "n"), "l",
                     np.where(((Rb < -0.5) | (Rb > 0.2)) & (flag != "n"),
-                             flag+[","]+["l"], flag)))
+                             flag+[","]+["l"], flag))
     flag = np.where((itera == -1) & (flag == "n"), "i",
                     np.where((itera == -1) & (flag != "n"), flag+[","]+["i"],
                              flag))