diff --git a/src/fileFormats/vtk/format/foamVtkAsciiFormatter.C b/src/fileFormats/vtk/format/foamVtkAsciiFormatter.C
index d850bf186f..8533d20ac0 100644
--- a/src/fileFormats/vtk/format/foamVtkAsciiFormatter.C
+++ b/src/fileFormats/vtk/format/foamVtkAsciiFormatter.C
@@ -5,7 +5,7 @@
     \\  /    A nd           | www.openfoam.com
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
-    Copyright (C) 2016-2018 OpenCFD Ltd.
+    Copyright (C) 2016-2021 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -41,7 +41,7 @@ Foam::vtk::asciiFormatter::opts_(formatType::INLINE_ASCII);
 
 inline void Foam::vtk::asciiFormatter::next()
 {
-    if (pos_ == 6)
+    if (pos_ >= itemsPerLine_)
     {
         os()<< '\n';
         pos_ = 0;
diff --git a/src/fileFormats/vtk/format/foamVtkAsciiFormatter.H b/src/fileFormats/vtk/format/foamVtkAsciiFormatter.H
index f01a0dbef6..49d00918f7 100644
--- a/src/fileFormats/vtk/format/foamVtkAsciiFormatter.H
+++ b/src/fileFormats/vtk/format/foamVtkAsciiFormatter.H
@@ -5,7 +5,7 @@
     \\  /    A nd           | www.openfoam.com
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
-    Copyright (C) 2016-2018 OpenCFD Ltd.
+    Copyright (C) 2016-2021 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
     This file is part of OpenFOAM.
@@ -28,7 +28,7 @@ Class
 
 Description
     Inline ASCII output.
-    Adds spaces between entries and a newline every 6 items
+    Adds spaces between entries and a newline every 9 items
     (for consistency with what VTK itself outputs).
 
 SourceFiles
@@ -61,6 +61,9 @@ class asciiFormatter
         static const char* name_;
         static const outputOptions opts_;
 
+        //- Number of items per line
+        static constexpr unsigned short itemsPerLine_ = 9;
+
         //- Track the current output position
         unsigned short pos_;