diff --git a/src/OpenFOAM/containers/Lists/List/List.C b/src/OpenFOAM/containers/Lists/List/List.C
index 426efed774..6692039ca0 100644
--- a/src/OpenFOAM/containers/Lists/List/List.C
+++ b/src/OpenFOAM/containers/Lists/List/List.C
@@ -6,7 +6,7 @@
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
     Copyright (C) 2011-2016 OpenFOAM Foundation
-    Copyright (C) 2017-2019 OpenCFD Ltd.
+    Copyright (C) 2017-2020 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -369,7 +369,7 @@ Foam::List<T>::List(std::initializer_list<T> list)
 template<class T>
 Foam::List<T>::List(List<T>&& list)
 :
-    UList<T>(nullptr, 0)
+    UList<T>()
 {
     // Can use transfer or swap to manage content
     transfer(list);
@@ -380,7 +380,7 @@ template<class T>
 template<int SizeMin>
 Foam::List<T>::List(DynamicList<T, SizeMin>&& list)
 :
-    UList<T>(nullptr, 0)
+    UList<T>()
 {
     transfer(list);
 }
@@ -389,7 +389,7 @@ Foam::List<T>::List(DynamicList<T, SizeMin>&& list)
 template<class T>
 Foam::List<T>::List(SortableList<T>&& list)
 :
-    UList<T>(nullptr, 0)
+    UList<T>()
 {
     transfer(list);
 }
@@ -398,7 +398,7 @@ Foam::List<T>::List(SortableList<T>&& list)
 template<class T>
 Foam::List<T>::List(SLList<T>&& list)
 :
-    UList<T>(nullptr, 0)
+    UList<T>()
 {
     operator=(std::move(list));
 }
@@ -531,18 +531,33 @@ void Foam::List<T>::operator=(const SLList<T>& list)
 
     if (len)
     {
-        List_ACCESS(T, (*this), vp);
+        T* iter = this->begin();
 
-        label i = 0;
-        for (auto iter = list.cbegin(); iter != list.cend(); ++iter)
+        for (const T& val : list)
         {
-            vp[i] = *iter;
-            ++i;
+            *iter = val;
+            ++iter;
         }
     }
 }
 
 
+template<class T>
+template<unsigned N>
+void Foam::List<T>::operator=(const FixedList<T, N>& list)
+{
+    reAlloc(label(N));
+
+    T* iter = this->begin();
+
+    for (const T& val : list)
+    {
+        *iter = val;
+        ++iter;
+    }
+}
+
+
 template<class T>
 template<class Addr>
 void Foam::List<T>::operator=(const IndirectListBase<T, Addr>& list)
@@ -572,13 +587,12 @@ void Foam::List<T>::operator=(std::initializer_list<T> list)
 
     if (len)
     {
-        List_ACCESS(T, (*this), vp);
+        T* iter = this->begin();
 
-        label i = 0;
         for (const T& val : list)
         {
-            vp[i] = val;
-            ++i;
+            *iter = val;
+            ++iter;
         }
     }
 }
@@ -614,18 +628,16 @@ void Foam::List<T>::operator=(SortableList<T>&& list)
 template<class T>
 void Foam::List<T>::operator=(SLList<T>&& list)
 {
-    const label len = list.size();
+    label len = list.size();
 
     reAlloc(len);
 
-    if (len)
-    {
-        List_ACCESS(T, (*this), vp);
+    T* iter = this->begin();
 
-        for (label i = 0; i < len; ++i)
-        {
-            vp[i] = std::move(list.removeHead());
-        }
+    while (len--)
+    {
+        *iter = std::move(list.removeHead());
+        ++iter;
     }
 
     list.clear();
diff --git a/src/OpenFOAM/containers/Lists/List/List.H b/src/OpenFOAM/containers/Lists/List/List.H
index b9ae065c13..9b5d43a609 100644
--- a/src/OpenFOAM/containers/Lists/List/List.H
+++ b/src/OpenFOAM/containers/Lists/List/List.H
@@ -52,7 +52,7 @@ SourceFiles
 namespace Foam
 {
 
-// Forward declarations
+// Forward Declarations
 class Istream;
 class Ostream;
 
@@ -268,6 +268,10 @@ public:
         template<class Addr>
         void operator=(const IndirectListBase<T, Addr>& list);
 
+        //- Copy assignment from FixedList
+        template<unsigned N>
+        void operator=(const FixedList<T, N>& list);
+
         //- Assignment to an initializer list
         void operator=(std::initializer_list<T> list);
 
diff --git a/src/OpenFOAM/containers/Lists/UList/UList.C b/src/OpenFOAM/containers/Lists/UList/UList.C
index 1d17f2dc5f..6564cf6642 100644
--- a/src/OpenFOAM/containers/Lists/UList/UList.C
+++ b/src/OpenFOAM/containers/Lists/UList/UList.C
@@ -160,8 +160,11 @@ const Foam::UList<T> Foam::UList<T>::operator[](const labelRange& range) const
 template<class T>
 void Foam::UList<T>::operator=(const T& val)
 {
+    const label len = this->size();
+
     List_ACCESS(T, (*this), vp);
-    List_FOR_ALL((*this), i)
+
+    for (label i=0; i < len; ++i)
     {
         vp[i] = val;
     }
@@ -171,8 +174,11 @@ void Foam::UList<T>::operator=(const T& val)
 template<class T>
 void Foam::UList<T>::operator=(const zero)
 {
+    const label len = this->size();
+
     List_ACCESS(T, (*this), vp);
-    List_FOR_ALL((*this), i)
+
+    for (label i=0; i < len; ++i)
     {
         vp[i] = Zero;
     }