diff --git a/src/one-body-sample.cc b/src/one-body-sample.cc
index 8e913454f0fe4af9ccf215f9d818eef0a4956870..4d28c36daa823e3ab4ec810e1ade4db511f47e09 100644
--- a/src/one-body-sample.cc
+++ b/src/one-body-sample.cc
@@ -471,7 +471,7 @@ int main(int argc, char *argv[]) {
         alpha_initial, frictionalNodes, frictionData);
 
     VectorType v = v_initial;
-    SingletonVectorType alpha = alpha_initial;
+    SingletonVectorType alpha(finestSize);
 
     auto const timesteps = parset.get<size_t>("timeSteps.number"),
                state_fpi_max = parset.get<size_t>("v.fpi.maximumIterations"),