diff --git a/src/recurrence/recModel/gerhardsRecModel/gerhardsRecModel.C b/src/recurrence/recModel/gerhardsRecModel/gerhardsRecModel.C
index c6e084ce..e4245b27 100644
--- a/src/recurrence/recModel/gerhardsRecModel/gerhardsRecModel.C
+++ b/src/recurrence/recModel/gerhardsRecModel/gerhardsRecModel.C
@@ -290,7 +290,7 @@ void gerhardsRecModel::readFieldSeries()
                 for OpenFOAM versions prior to OpenFOAM-5.0
                 Do this the other way around for OpenFOAM-5.0 and potentially later versions
             */
-            if (not header.headerOk())
+            if (! header.headerOk())
             {
                 FatalError
                 << "Field " << volScalarFieldNames_[i] << " not found"
@@ -314,7 +314,7 @@ void gerhardsRecModel::readFieldSeries()
                 for OpenFOAM versions prior to OpenFOAM-5.0
                 Do this the other way around for OpenFOAM-5.0 and potentially later versions
             */
-            if (not header.headerOk())
+            if (! header.headerOk())
             {
                 FatalError
                 << "Field " << volVectorFieldNames_[i] << " not found"
@@ -338,7 +338,7 @@ void gerhardsRecModel::readFieldSeries()
                 for OpenFOAM versions prior to OpenFOAM-5.0
                 Do this the other way around for OpenFOAM-5.0 and potentially later versions
             */
-            if (not header.headerOk())
+            if (! header.headerOk())
             {
                 FatalError
                 << "Field " << surfaceScalarFieldNames_[i] << " not found"
@@ -927,7 +927,7 @@ Switch gerhardsRecModel::checkSkipZero()
             }
         }
 
-        if (not foundZero)
+        if (! foundZero)
         {
             skipZero_ = false;
         }
diff --git a/src/recurrence/recPath/MarkovPath/MarkovPath.C b/src/recurrence/recPath/MarkovPath/MarkovPath.C
index d7624388..1070466e 100644
--- a/src/recurrence/recPath/MarkovPath/MarkovPath.C
+++ b/src/recurrence/recPath/MarkovPath/MarkovPath.C
@@ -115,7 +115,7 @@ void MarkovPath::getRecPath()
     Pstream::scatter(numRecIntervals);
     Pstream::scatter(recSteps_);
 
-    if (not Pstream::master())
+    if (!Pstream::master())
     {
         virtualTimeIndexList_.setSize(numRecIntervals);
     }
diff --git a/src/recurrence/recPath/multiIntervalPath/multiIntervalPath.C b/src/recurrence/recPath/multiIntervalPath/multiIntervalPath.C
index 53a77c69..c476e4dc 100644
--- a/src/recurrence/recPath/multiIntervalPath/multiIntervalPath.C
+++ b/src/recurrence/recPath/multiIntervalPath/multiIntervalPath.C
@@ -120,7 +120,7 @@ void multiIntervalPath::getRecPath()
 
     Pstream::scatter(numRecIntervals);
 
-    if (not Pstream::master())
+    if (!Pstream::master())
     {
         virtualTimeIndexList_.setSize(numRecIntervals);
     }
diff --git a/src/recurrence/recPath/noPath/noPath.C b/src/recurrence/recPath/noPath/noPath.C
index 7d768423..faed451b 100644
--- a/src/recurrence/recPath/noPath/noPath.C
+++ b/src/recurrence/recPath/noPath/noPath.C
@@ -77,7 +77,7 @@ void noPath::getRecPath()
 
     Pstream::scatter(numRecIntervals);
 
-    if (not Pstream::master())
+    if (!Pstream::master())
     {
         virtualTimeIndexList_.setSize(numRecIntervals);
     }
diff --git a/src/recurrence/recPath/simpleRandomPath/simpleRandomPath.C b/src/recurrence/recPath/simpleRandomPath/simpleRandomPath.C
index 7e52d479..70e89657 100644
--- a/src/recurrence/recPath/simpleRandomPath/simpleRandomPath.C
+++ b/src/recurrence/recPath/simpleRandomPath/simpleRandomPath.C
@@ -77,7 +77,7 @@ void simpleRandomPath::getRecPath()
 
     Pstream::scatter(numRecIntervals);
 
-    if(not Pstream::master())
+    if(!Pstream::master())
     {
         virtualTimeIndexList_.setSize(numRecIntervals);
     }