diff --git a/src/OpenFOAM/primitives/spatialVectorAlgebra/CompactSpatialTensor/CompactSpatialTensor.H b/src/OpenFOAM/primitives/spatialVectorAlgebra/CompactSpatialTensor/CompactSpatialTensor.H
index fa2b14f6c9..03e6dcc565 100644
--- a/src/OpenFOAM/primitives/spatialVectorAlgebra/CompactSpatialTensor/CompactSpatialTensor.H
+++ b/src/OpenFOAM/primitives/spatialVectorAlgebra/CompactSpatialTensor/CompactSpatialTensor.H
@@ -72,7 +72,7 @@ public:
         //- Construct null
         inline CompactSpatialTensor();
 
-        inline explicit CompactSpatialTensor(const Foam::zero);
+        inline CompactSpatialTensor(const Foam::zero);
 
         //- Construct given MatrixSpace of the same rank
         inline CompactSpatialTensor
diff --git a/src/OpenFOAM/primitives/spatialVectorAlgebra/CompactSpatialTensorT/CompactSpatialTensorT.H b/src/OpenFOAM/primitives/spatialVectorAlgebra/CompactSpatialTensorT/CompactSpatialTensorT.H
index eedc364357..2ec83b589f 100644
--- a/src/OpenFOAM/primitives/spatialVectorAlgebra/CompactSpatialTensorT/CompactSpatialTensorT.H
+++ b/src/OpenFOAM/primitives/spatialVectorAlgebra/CompactSpatialTensorT/CompactSpatialTensorT.H
@@ -71,7 +71,7 @@ public:
         //- Construct null
         inline CompactSpatialTensorT();
 
-        inline explicit CompactSpatialTensorT(const Foam::zero);
+        inline CompactSpatialTensorT(const Foam::zero);
 
         //- Construct given MatrixSpace of the same rank
         inline CompactSpatialTensorT
diff --git a/src/OpenFOAM/primitives/spatialVectorAlgebra/SpatialTensor/SpatialTensor.H b/src/OpenFOAM/primitives/spatialVectorAlgebra/SpatialTensor/SpatialTensor.H
index 52c81866c6..63e2d7e7b7 100644
--- a/src/OpenFOAM/primitives/spatialVectorAlgebra/SpatialTensor/SpatialTensor.H
+++ b/src/OpenFOAM/primitives/spatialVectorAlgebra/SpatialTensor/SpatialTensor.H
@@ -87,7 +87,7 @@ public:
         inline SpatialTensor();
 
         //- Construct initialized to zero
-        inline explicit SpatialTensor(const Foam::zero);
+        inline SpatialTensor(const Foam::zero);
 
         //- Construct given MatrixSpace of the same rank
         inline SpatialTensor(const typename SpatialTensor::msType&);
diff --git a/src/OpenFOAM/primitives/spatialVectorAlgebra/SpatialVector/SpatialVector.H b/src/OpenFOAM/primitives/spatialVectorAlgebra/SpatialVector/SpatialVector.H
index 33741f3143..ef48678f2a 100644
--- a/src/OpenFOAM/primitives/spatialVectorAlgebra/SpatialVector/SpatialVector.H
+++ b/src/OpenFOAM/primitives/spatialVectorAlgebra/SpatialVector/SpatialVector.H
@@ -92,7 +92,7 @@ public:
         inline SpatialVector();
 
         //- Construct initialized to zero
-        inline explicit SpatialVector(const Foam::zero);
+        inline SpatialVector(const Foam::zero);
 
         //- Construct given VectorSpace of the same rank
         inline SpatialVector(const typename SpatialVector::vsType&);