diff --git a/src/OpenFOAM/primitives/Pair/Pair.H b/src/OpenFOAM/primitives/Pair/Pair.H
index 9b5944b52..d050b6d75 100644
--- a/src/OpenFOAM/primitives/Pair/Pair.H
+++ b/src/OpenFOAM/primitives/Pair/Pair.H
@@ -116,6 +116,7 @@ public:
                 FatalErrorInFunction
                     << "Call to other only valid for Pair with differing"
                     << " elements:" << *this << abort(FatalError);
+                return first();
             }
             else if (first() == a)
             {