diff --git a/applications/utilities/parallelProcessing/redistributePar/passivePositionParticle.H b/applications/utilities/parallelProcessing/redistributePar/passivePositionParticle.H
index 41cc7c16ed..76e8084b80 100644
--- a/applications/utilities/parallelProcessing/redistributePar/passivePositionParticle.H
+++ b/applications/utilities/parallelProcessing/redistributePar/passivePositionParticle.H
@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           | Copyright (C) 2017 OpenCFD Ltd.
+    \\  /    A nd           | Copyright (C) 2017-2018 OpenCFD Ltd.
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -122,17 +122,7 @@ public:
         {
             // Copy data into old format structure. Exact opposite of
             // particleIO.C reading old format.
-            struct oldParticle
-            {
-                vector position;
-                label celli;
-                label facei;
-                scalar stepFraction;
-                label tetFacei;
-                label tetPti;
-                label origProc;
-                label origId;
-            } p;
+            particle::positionsCompat1706 p;
 
             p.position = ppi.position_;
             p.celli = ppi.cell();
@@ -158,7 +148,8 @@ public:
             {
                 const std::size_t sizeofFields
                 (
-                    sizeof(oldParticle) - offsetof(oldParticle, position)
+                    sizeof(particle::positionsCompat1706)
+                  - offsetof(particle::positionsCompat1706, position)
                 );
 
                 os.write
diff --git a/src/lagrangian/basic/IOPosition/IOPosition.C b/src/lagrangian/basic/IOPosition/IOPosition.C
index 69eeca2474..959db07300 100644
--- a/src/lagrangian/basic/IOPosition/IOPosition.C
+++ b/src/lagrangian/basic/IOPosition/IOPosition.C
@@ -23,8 +23,6 @@ License
 
 \*---------------------------------------------------------------------------*/
 
-#include "IOPosition.H"
-
 // * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
 
 template<class CloudType>
diff --git a/src/lagrangian/basic/injectedParticle/injectedParticleIO.C b/src/lagrangian/basic/injectedParticle/injectedParticleIO.C
index 72d6e87bcb..066eb6444d 100644
--- a/src/lagrangian/basic/injectedParticle/injectedParticleIO.C
+++ b/src/lagrangian/basic/injectedParticle/injectedParticleIO.C
@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           | Copyright (C) 2016-2017 OpenCFD Ltd.
+    \\  /    A nd           | Copyright (C) 2016-2018 OpenCFD Ltd.
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -204,20 +204,12 @@ void Foam::injectedParticle::writePosition(Ostream& os) const
     }
     else
     {
-        struct oldParticle
-        {
-            vector position;
-            label celli;
-            label facei;
-            scalar stepFraction;
-            label tetFacei;
-            label tetPti;
-            label origProc;
-            label origId;
-        } p;
+        positionsCompat1706 p;
 
         const size_t s =
-            offsetof(oldParticle, facei) - offsetof(oldParticle, position);
+        (
+            offsetof(positionsCompat1706, facei)
+          - offsetof(positionsCompat1706, position));
 
         p.position = position_;
         p.celli = cell();
diff --git a/src/lagrangian/basic/particle/particle.H b/src/lagrangian/basic/particle/particle.H
index beb2c8a4d6..35da9c8d03 100644
--- a/src/lagrangian/basic/particle/particle.H
+++ b/src/lagrangian/basic/particle/particle.H
@@ -126,6 +126,20 @@ public:
     };
 
 
+    //- Old particle positions content for OpenFOAM-1706 and earlier
+    struct positionsCompat1706
+    {
+        vector position;
+        label celli;
+        label facei;
+        scalar stepFraction;
+        label tetFacei;
+        label tetPti;
+        label origProc;
+        label origId;
+    };
+
+
 private:
 
     // Private data
diff --git a/src/lagrangian/basic/particle/particleIO.C b/src/lagrangian/basic/particle/particleIO.C
index 8115ad62f5..fe234c0753 100644
--- a/src/lagrangian/basic/particle/particleIO.C
+++ b/src/lagrangian/basic/particle/particleIO.C
@@ -3,7 +3,7 @@
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
     \\  /    A nd           | Copyright (C) 2011-2017 OpenFOAM Foundation
-     \\/     M anipulation  | Copyright (C) 2016 OpenCFD Ltd.
+     \\/     M anipulation  | Copyright (C) 2016-2018 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -86,17 +86,7 @@ Foam::particle::particle
     }
     else
     {
-        struct oldParticle
-        {
-            vector position;
-            label celli;
-            label facei;
-            scalar stepFraction;
-            label tetFacei;
-            label tetPti;
-            label origProc;
-            label origId;
-        } p;
+        positionsCompat1706 p;
 
         if (is.format() == IOstream::ASCII)
         {
@@ -118,15 +108,20 @@ Foam::particle::particle
             {
                 // Read whole struct
                 const size_t s =
-                    sizeof(oldParticle) - offsetof(oldParticle, position);
+                (
+                    sizeof(positionsCompat1706)
+                  - offsetof(positionsCompat1706, position)
+                );
                 is.read(reinterpret_cast<char*>(&p.position), s);
             }
             else
             {
                 // Read only position and cell
                 const size_t s =
-                    offsetof(oldParticle, facei)
-                  - offsetof(oldParticle, position);
+                (
+                    offsetof(positionsCompat1706, facei)
+                  - offsetof(positionsCompat1706, position)
+                );
                 is.read(reinterpret_cast<char*>(&p.position), s);
             }
         }
@@ -181,20 +176,13 @@ void Foam::particle::writePosition(Ostream& os) const
     }
     else
     {
-        struct oldParticle
-        {
-            vector position;
-            label celli;
-            label facei;
-            scalar stepFraction;
-            label tetFacei;
-            label tetPti;
-            label origProc;
-            label origId;
-        } p;
+        positionsCompat1706 p;
 
         const size_t s =
-            offsetof(oldParticle, facei) - offsetof(oldParticle, position);
+        (
+            offsetof(positionsCompat1706, facei)
+          - offsetof(positionsCompat1706, position)
+        );
 
         p.position = position();
         p.celli = celli_;