diff --git a/src/dynamicMesh/meshMotion/fvMotionSolver/pointPatchFields/derived/surfaceSlipDisplacement/surfaceSlipDisplacementPointPatchVectorField.C b/src/dynamicMesh/meshMotion/fvMotionSolver/pointPatchFields/derived/surfaceSlipDisplacement/surfaceSlipDisplacementPointPatchVectorField.C
index 9e8dedabf..adcb8f99a 100644
--- a/src/dynamicMesh/meshMotion/fvMotionSolver/pointPatchFields/derived/surfaceSlipDisplacement/surfaceSlipDisplacementPointPatchVectorField.C
+++ b/src/dynamicMesh/meshMotion/fvMotionSolver/pointPatchFields/derived/surfaceSlipDisplacement/surfaceSlipDisplacementPointPatchVectorField.C
@@ -177,7 +177,7 @@ void surfaceSlipDisplacementPointPatchVectorField::evaluate
     const scalar projectLen = mag(mesh.bounds().max()-mesh.bounds().min());
 
     // For case of fixed projection vector:
-    vector projectVec;
+    vector projectVec = vector::zero;
     if (projectMode_ == FIXEDNORMAL)
     {
         vector n = projectDir_/mag(projectDir_);