diff --git a/src/one-body-sample.cc b/src/one-body-sample.cc
index 4842a445d6c09b89d4cf36f51f2665ea8704d57d..aca2b01ff42281bd1ec60ffbcee5755489e47990 100644
--- a/src/one-body-sample.cc
+++ b/src/one-body-sample.cc
@@ -251,40 +251,43 @@ int main(int argc, char *argv[]) {
     MatrixType massMatrix;
     VectorType gravityFunctional;
     {
-      // Assemble mass matrix and compute density
-      MassAssembler<GridType, P1Basis::LocalFiniteElement,
-                    P1Basis::LocalFiniteElement> const localMass;
-      OperatorAssembler<P1Basis, P1Basis>(p1Basis, p1Basis)
-          .assemble(localMass, massMatrix);
+      double const gravity = 9.81;
+      double const density = parset.get<double>("body.density");
 
-      double volume = 1.0;
-      for (int i = 0; i < dim; ++i)
-        volume *= (upperRight[i] - lowerLeft[i]);
+      { // Assemble mass matrix
+        MassAssembler<GridType, P1Basis::LocalFiniteElement,
+                      P1Basis::LocalFiniteElement> const localMass;
+        OperatorAssembler<P1Basis, P1Basis>(p1Basis, p1Basis)
+            .assemble(localMass, massMatrix);
+        massMatrix *= density;
+      }
 
-      double area = 1.0;
-      for (int i = 0; i < dim; ++i)
-        if (i != 1)
-          area *= (upperRight[i] - lowerLeft[i]);
+      { // Compute normal stress
+        double volume = 1.0;
+        for (int i = 0; i < dim; ++i)
+          volume *= (upperRight[i] - lowerLeft[i]);
 
-      double const gravity = 9.81;
-      double const density = parset.get<double>("body.density");
+        double area = 1.0;
+        for (int i = 0; i < dim; ++i)
+          if (i != 1)
+            area *= (upperRight[i] - lowerLeft[i]);
+
+        // volume * gravity * density / area    = normal stress
+        // V      * g       * rho     / A       = sigma_n
+        // m^d    * N/kg    * kg/m^d  / m^(d-1) = N/m^(d-1)
+        normalStress = volume * gravity * density / area;
+      }
 
-      // volume * gravity * density / area    = normal stress
-      // V      * g       * rho     / A       = sigma_n
-      // m^d    * N/kg    * kg/m^d  / m^(d-1) = N/m^(d-1)
-      normalStress = volume * gravity * density / area;
-
-      massMatrix *= density;
-
-      // Compute gravitational body force
-      SmallVector weightedGravitationalDirection(0);
-      weightedGravitationalDirection[1] = -density * gravity;
-      ConstantFunction<SmallVector, SmallVector> const gravityFunction(
-          weightedGravitationalDirection);
-      L2FunctionalAssembler<GridType, SmallVector> gravityFunctionalAssembler(
-          gravityFunction);
-      FunctionalAssembler<P1Basis>(p1Basis)
-          .assemble(gravityFunctionalAssembler, gravityFunctional, true);
+      { // Compute gravitational body force
+        SmallVector weightedGravitationalDirection(0);
+        weightedGravitationalDirection[1] = -density * gravity;
+        ConstantFunction<SmallVector, SmallVector> const gravityFunction(
+            weightedGravitationalDirection);
+        L2FunctionalAssembler<GridType, SmallVector> gravityFunctionalAssembler(
+            gravityFunction);
+        FunctionalAssembler<P1Basis>(p1Basis)
+            .assemble(gravityFunctionalAssembler, gravityFunctional, true);
+      }
     }
 
     // Assemble elastic force on the body