diff --git a/src/OSspecific/POSIX/POSIX.C b/src/OSspecific/POSIX/POSIX.C
index 4b6a27f4079c5c43793d45cdad00ce9c2dc01b02..ab31c18e5858291afdc5eef70e2016ff0e9049d8 100644
--- a/src/OSspecific/POSIX/POSIX.C
+++ b/src/OSspecific/POSIX/POSIX.C
@@ -577,7 +577,7 @@ mode_t Foam::mode(const fileName& name, const bool followLink)
     if (!name.empty())
     {
         fileStat fileStatus(name, followLink);
-        if (fileStatus.isValid())
+        if (fileStatus.valid())
         {
             return fileStatus.status().st_mode;
         }
@@ -705,7 +705,7 @@ off_t Foam::fileSize(const fileName& name, const bool followLink)
     if (!name.empty())
     {
         fileStat fileStatus(name, followLink);
-        if (fileStatus.isValid())
+        if (fileStatus.valid())
         {
             return fileStatus.status().st_size;
         }
diff --git a/src/OSspecific/POSIX/fileStat.C b/src/OSspecific/POSIX/fileStat.C
index 52cdf7dbd8f6a2f125600909501ce02283c10f67..c3a118ba5bbe9d51c4657f572696938617cfc9bd 100644
--- a/src/OSspecific/POSIX/fileStat.C
+++ b/src/OSspecific/POSIX/fileStat.C
@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           | Copyright (C) 2004-2011, 2016-2018 OpenCFD Ltd.
+    \\  /    A nd           | Copyright (C) 2004-2011, 2016-2019 OpenCFD Ltd.
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
                             | Copyright (C) 2011-2015 OpenFOAM Foundation
@@ -38,7 +38,7 @@ License
 
 Foam::fileStat::fileStat()
 :
-    isValid_(false)
+    valid_(false)
 {}
 
 
@@ -49,7 +49,7 @@ Foam::fileStat::fileStat
     const unsigned int maxTime
 )
 :
-    isValid_(false)
+    valid_(false)
 {
     if (!fName || !fName[0])
     {
@@ -74,7 +74,7 @@ Foam::fileStat::fileStat
     }
 
     // Copy into (non-volatile, possible register based) member var
-    isValid_ = locIsValid;
+    valid_ = locIsValid;
 }
 
 
@@ -99,13 +99,13 @@ Foam::fileStat::fileStat(Istream& is)
 
 Foam::label Foam::fileStat::size() const
 {
-    return isValid_ ? label(status_.st_size) : 0;
+    return valid_ ? label(status_.st_size) : 0;
 }
 
 
 time_t Foam::fileStat::modTime() const
 {
-    return isValid_ ? status_.st_mtime : 0;
+    return valid_ ? status_.st_mtime : 0;
 }
 
 
@@ -113,7 +113,7 @@ double Foam::fileStat::dmodTime() const
 {
     return
     (
-        isValid_
+        valid_
       ?
         #ifdef darwin
         (status_.st_mtime + 1e-9*status_.st_mtimespec.tv_nsec)
@@ -128,7 +128,7 @@ double Foam::fileStat::dmodTime() const
 bool Foam::fileStat::sameDevice(const fileStat& other) const
 {
     return
-        isValid_
+        valid_
      && (
             major(status_.st_dev) == major(other.status_.st_dev)
          && minor(status_.st_dev) == minor(other.status_.st_dev)
@@ -138,64 +138,64 @@ bool Foam::fileStat::sameDevice(const fileStat& other) const
 
 bool Foam::fileStat::sameINode(const fileStat& other) const
 {
-    return isValid_ && (status_.st_ino == other.status_.st_ino);
+    return valid_ && (status_.st_ino == other.status_.st_ino);
 }
 
 
 bool Foam::fileStat::sameINode(const label iNode) const
 {
-    return isValid_ && (status_.st_ino == ino_t(iNode));
+    return valid_ && (status_.st_ino == ino_t(iNode));
 }
 
 
 // * * * * * * * * * * * * * * * Friend Operators  * * * * * * * * * * * * * //
 
-Foam::Istream& Foam::operator>>(Istream& is, fileStat& fStat)
+Foam::Istream& Foam::operator>>(Istream& is, fileStat& fs)
 {
-    FixedList<label, 13> stat(is);
+    FixedList<label, 13> list(is);
 
-    fStat.isValid_ = stat[0];
+    fs.valid_ = list[0];
 
-    dev_t st_dev = makedev(stat[1], stat[2]);
-    fStat.status_.st_dev = st_dev;
+    dev_t st_dev = makedev(list[1], list[2]);
+    fs.status_.st_dev = st_dev;
 
-    fStat.status_.st_ino = stat[3];
-    fStat.status_.st_mode = stat[4];
-    fStat.status_.st_uid = stat[5];
-    fStat.status_.st_gid = stat[6];
+    fs.status_.st_ino = list[3];
+    fs.status_.st_mode = list[4];
+    fs.status_.st_uid = list[5];
+    fs.status_.st_gid = list[6];
 
-    dev_t st_rdev = makedev(stat[7], stat[8]);
-    fStat.status_.st_rdev = st_rdev;
+    dev_t st_rdev = makedev(list[7], list[8]);
+    fs.status_.st_rdev = st_rdev;
 
-    fStat.status_.st_size = stat[9];
-    fStat.status_.st_atime = stat[10];
-    fStat.status_.st_mtime = stat[11];
-    fStat.status_.st_ctime = stat[12];
+    fs.status_.st_size = list[9];
+    fs.status_.st_atime = list[10];
+    fs.status_.st_mtime = list[11];
+    fs.status_.st_ctime = list[12];
 
     is.check(FUNCTION_NAME);
     return is;
 }
 
 
-Foam::Ostream& Foam::operator<<(Ostream& os, const fileStat& fStat)
+Foam::Ostream& Foam::operator<<(Ostream& os, const fileStat& fs)
 {
-    FixedList<label, 13> stat;
-
-    stat[0] = label(fStat.isValid_);
-    stat[1] = label(major(fStat.status_.st_dev));
-    stat[2] = label(minor(fStat.status_.st_dev));
-    stat[3] = label(fStat.status_.st_ino);
-    stat[4] = label(fStat.status_.st_mode);
-    stat[5] = label(fStat.status_.st_uid);
-    stat[6] = label(fStat.status_.st_gid);
-    stat[7] = label(major(fStat.status_.st_rdev));
-    stat[8] = label(minor(fStat.status_.st_rdev));
-    stat[9] = label(fStat.status_.st_size);
-    stat[10] = label(fStat.status_.st_atime);
-    stat[11] = label(fStat.status_.st_mtime);
-    stat[12] = label(fStat.status_.st_ctime);
-
-    return os << stat;
+    FixedList<label, 13> list;
+
+    list[0] = label(fs.valid_);
+    list[1] = label(major(fs.status_.st_dev));
+    list[2] = label(minor(fs.status_.st_dev));
+    list[3] = label(fs.status_.st_ino);
+    list[4] = label(fs.status_.st_mode);
+    list[5] = label(fs.status_.st_uid);
+    list[6] = label(fs.status_.st_gid);
+    list[7] = label(major(fs.status_.st_rdev));
+    list[8] = label(minor(fs.status_.st_rdev));
+    list[9] = label(fs.status_.st_size);
+    list[10] = label(fs.status_.st_atime);
+    list[11] = label(fs.status_.st_mtime);
+    list[12] = label(fs.status_.st_ctime);
+
+    return os << list;
 }
 
 
diff --git a/src/OSspecific/POSIX/fileStat.H b/src/OSspecific/POSIX/fileStat.H
index 13b17f3d0f5ea7457156454eae0e83fb7c2edb8a..bd736322774d87fc17cf04c60460f82916d34bfc 100644
--- a/src/OSspecific/POSIX/fileStat.H
+++ b/src/OSspecific/POSIX/fileStat.H
@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     |
-    \\  /    A nd           | Copyright (C) 2004-2010, 2016-2018 OpenCFD Ltd.
+    \\  /    A nd           | Copyright (C) 2004-2010, 2016-2019 OpenCFD Ltd.
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
                             | Copyright (C) 2011-2015 OpenFOAM Foundation
@@ -56,12 +56,12 @@ namespace Foam
 // Forward declarations
 class fileStat;
 
-Istream& operator>>(Istream& is, fileStat& fStat);
-Ostream& operator<<(Ostream& os, const fileStat& fStat);
+Istream& operator>>(Istream& is, fileStat& fs);
+Ostream& operator<<(Ostream& os, const fileStat& fs);
 
 
 /*---------------------------------------------------------------------------*\
-                           Class fileStat Declaration
+                          Class fileStat Declaration
 \*---------------------------------------------------------------------------*/
 
 class fileStat
@@ -70,7 +70,7 @@ class fileStat
 
         struct stat status_;
 
-        bool isValid_;
+        bool valid_;
 
 
 public:
@@ -125,9 +125,9 @@ public:
         }
 
         //- Was file-stat successful?
-        bool isValid() const
+        bool valid() const
         {
-            return isValid_;
+            return valid_;
         }
 
         //- Size in bytes. Zero for an invalid file-stat.
@@ -156,8 +156,16 @@ public:
 
     // IOstream Operators
 
-        friend Istream& operator>>(Istream& is, fileStat& fStat);
-        friend Ostream& operator<<(Ostream& os, const fileStat& fStat);
+        friend Istream& operator>>(Istream& is, fileStat& fs);
+        friend Ostream& operator<<(Ostream& os, const fileStat& fs);
+
+
+    // Housekeeping
+
+        //- Deprecated(2019-04) Was file-stat successful?
+        //  \deprecated(2019-04) - use valid() method
+        bool isValid() const { return valid_; }
+
 };