diff --git a/SimPEG/EM/FDEM/SrcFDEM.py b/SimPEG/EM/FDEM/SrcFDEM.py
index 2c97adf1..e7650164 100644
--- a/SimPEG/EM/FDEM/SrcFDEM.py
+++ b/SimPEG/EM/FDEM/SrcFDEM.py
@@ -156,7 +156,6 @@ class RawVec_e(BaseSrc):
     def __init__(self, rxList, freq, s_e):
         self._s_e = np.array(s_e, dtype=complex)
         self.freq = float(freq)
-        self._ePrimary = ePrimary
 
         BaseSrc.__init__(self, rxList)