diff --git a/radio/FirComplex.hpp b/radio/FirComplex.hpp
index e75c836..cd42076 100644
--- a/radio/FirComplex.hpp
+++ b/radio/FirComplex.hpp
@@ -40,7 +40,7 @@ public:
 
 	ComplexScalar process(CVec const &coeff)
 	{
-		return ctrans(m_state) * coeff;
+		return trans(m_state) * conj(coeff);
 	}
 	
 	ComplexScalar processReal(RVec const &coeff)