diff --git a/src/OpenFOAM/primitives/Pair/PairI.H b/src/OpenFOAM/primitives/Pair/PairI.H
index 2f489a0380..87e0d83f1c 100644
--- a/src/OpenFOAM/primitives/Pair/PairI.H
+++ b/src/OpenFOAM/primitives/Pair/PairI.H
@@ -68,7 +68,7 @@ inline Foam::Pair<T>::Pair(const FixedList<T, 2>& lst)
 template<class T>
 inline Foam::Pair<T>::Pair(const T& f, const T& s, const bool doSort)
 {
-    if (doSort && f < s)
+    if (doSort && s < f)
     {
         first()  = s;
         second() = f;
@@ -88,7 +88,6 @@ inline Foam::Pair<T>::Pair(const FixedList<T, 2>& lst, const bool doSort)
 {}
 
 
-
 template<class T>
 inline Foam::Pair<T>::Pair(Istream& is)
 :