diff --git a/src/OpenFOAM/containers/Lists/FixedList/FixedList.H b/src/OpenFOAM/containers/Lists/FixedList/FixedList.H
index 5d94034762..b56720274c 100644
--- a/src/OpenFOAM/containers/Lists/FixedList/FixedList.H
+++ b/src/OpenFOAM/containers/Lists/FixedList/FixedList.H
@@ -467,7 +467,6 @@ inline void Swap(FixedList<T,Size>& lhs, FixedList<T,Size>& rhs);
 
 //- Hashing for FixedList data, which uses Hasher for contiguous data and
 //- element-wise incrementally hashing otherwise.
-template<>
 template<class T, unsigned N>
 struct Hash<FixedList<T, N>>
 {
diff --git a/src/OpenFOAM/containers/Lists/List/List.H b/src/OpenFOAM/containers/Lists/List/List.H
index 93cab9f7b1..6a8a55e9c4 100644
--- a/src/OpenFOAM/containers/Lists/List/List.H
+++ b/src/OpenFOAM/containers/Lists/List/List.H
@@ -348,7 +348,6 @@ public:
 
 //- Hashing for List data, which uses Hasher for contiguous data and
 //- element-wise incrementally hashing otherwise.
-template<>
 template<class T>
 struct Hash<List<T>>
 {
diff --git a/src/OpenFOAM/containers/Lists/UList/UList.H b/src/OpenFOAM/containers/Lists/UList/UList.H
index 246d566d9b..83ea75b1fd 100644
--- a/src/OpenFOAM/containers/Lists/UList/UList.H
+++ b/src/OpenFOAM/containers/Lists/UList/UList.H
@@ -594,7 +594,6 @@ inline void Swap(UList<T>& a, UList<T>& b);
 
 //- Hashing for UList data, which uses Hasher for contiguous data and
 //- element-wise incrementally hashing otherwise.
-template<>
 template<class T>
 struct Hash<UList<T>>
 {
diff --git a/src/OpenFOAM/primitives/Pair/Pair.H b/src/OpenFOAM/primitives/Pair/Pair.H
index af8d3a7321..123347fb8f 100644
--- a/src/OpenFOAM/primitives/Pair/Pair.H
+++ b/src/OpenFOAM/primitives/Pair/Pair.H
@@ -158,7 +158,6 @@ public:
 
 //- Hashing for Pair data, which uses Hasher for contiguous data and
 //- element-wise incrementally hashing otherwise.
-template<>
 template<class T>
 struct Hash<Pair<T>>
 {