diff --git a/src/OpenFOAM/primitives/polynomialEqns/cubicEqn/cubicEqn.C b/src/OpenFOAM/primitives/polynomialEqns/cubicEqn/cubicEqn.C
index 9633937f6..5e3b8899f 100644
--- a/src/OpenFOAM/primitives/polynomialEqns/cubicEqn/cubicEqn.C
+++ b/src/OpenFOAM/primitives/polynomialEqns/cubicEqn/cubicEqn.C
@@ -96,7 +96,7 @@ Foam::Roots<3> Foam::cubicEqn::roots() const
 
     if (oneReal)
     {
-        const Roots<1> r = linearEqn(- a, b/3).roots();
+        const Roots<1> r = linearEqn(a, b/3).roots();
         return Roots<3>(r.type(0), r[0]);
     }
     else if (twoReal)
diff --git a/src/OpenFOAM/primitives/polynomialEqns/quadraticEqn/quadraticEqn.C b/src/OpenFOAM/primitives/polynomialEqns/quadraticEqn/quadraticEqn.C
index 0fea8e6e9..cfcfceafa 100644
--- a/src/OpenFOAM/primitives/polynomialEqns/quadraticEqn/quadraticEqn.C
+++ b/src/OpenFOAM/primitives/polynomialEqns/quadraticEqn/quadraticEqn.C
@@ -71,7 +71,7 @@ Foam::Roots<2> Foam::quadraticEqn::roots() const
 
     if (oneReal)
     {
-        const Roots<1> r = linearEqn(- a, b/2).roots();
+        const Roots<1> r = linearEqn(a, b/2).roots();
         return Roots<2>(r, r);
     }
     else if (twoReal)