diff --git a/SimPEG/EM/FDEM/SrcFDEM.py b/SimPEG/EM/FDEM/SrcFDEM.py
index 54214e4f..55d0990f 100644
--- a/SimPEG/EM/FDEM/SrcFDEM.py
+++ b/SimPEG/EM/FDEM/SrcFDEM.py
@@ -627,6 +627,6 @@ class PrimSecSigma(BaseSrc):
     def s_eDeriv(self, prob, v, adjoint=False):
         if adjoint:
             return prob.MeSigmaDeriv(self.ePrimary(prob)).T * v
-        return prob.MeSigmaDeriv(self.ePrimary(prob)).T * v
+        return prob.MeSigmaDeriv(self.ePrimary(prob)) * v