diff --git a/src/finiteVolume/fields/fvPatchFields/derived/variableHeightFlowRateInletVelocity/variableHeightFlowRateInletVelocityFvPatchVectorField.C b/src/finiteVolume/fields/fvPatchFields/derived/variableHeightFlowRateInletVelocity/variableHeightFlowRateInletVelocityFvPatchVectorField.C
index 98d98f07bab1b46831c5e9ec2b3e6832bacb2c8f..d0911a49107df23b966433193e0105854a554566 100644
--- a/src/finiteVolume/fields/fvPatchFields/derived/variableHeightFlowRateInletVelocity/variableHeightFlowRateInletVelocityFvPatchVectorField.C
+++ b/src/finiteVolume/fields/fvPatchFields/derived/variableHeightFlowRateInletVelocity/variableHeightFlowRateInletVelocityFvPatchVectorField.C
@@ -107,8 +107,8 @@ void Foam::variableHeightFlowRateInletVelocityFvPatchVectorField
     scalarField alphap =
         patch().lookupPatchField<volScalarField, scalar>("alpha1");
 
-    alphap = max(alphap, 0.0);
-    alphap = min(alphap, 1.0);
+    alphap = max(alphap, scalar(0));
+    alphap = min(alphap, scalar(1));
 
     // a simpler way of doing this would be nice
     scalar avgU = -flowRate_/gSum(patch().magSf()*alphap);