diff --git a/framework/src/utils/RankFourTensor.C b/framework/src/utils/RankFourTensor.C
index 3e5cfbbf4883..0124b40f5934 100644
--- a/framework/src/utils/RankFourTensor.C
+++ b/framework/src/utils/RankFourTensor.C
@@ -12,6 +12,7 @@
 
 template class RankFourTensorTempl<Real>;
 template class RankFourTensorTempl<DualReal>;
+template class RankTwoTensorTempl<Complex>;
 
 namespace MathUtils
 {
@@ -53,3 +54,6 @@ template RankFourTensor RankFourTensor::operator*(const RankFourTensor & a) cons
 template ADRankFourTensor ADRankFourTensor::operator*(const RankFourTensor & a) const;
 template ADRankFourTensor RankFourTensor::operator*(const ADRankFourTensor & a) const;
 template ADRankFourTensor ADRankFourTensor::operator*(const ADRankFourTensor & a) const;
+
+template RankTwoTensorTempl<Complex>
+RankFourTensorTempl<Complex>::operator*(const RankTwoTensorTempl<Complex> & a) const;