diff --git a/src/modules/mesh/1DRad/moduleMesh1DRad.f90 b/src/modules/mesh/1DRad/moduleMesh1DRad.f90
index 99aef3e..79517d3 100644
--- a/src/modules/mesh/1DRad/moduleMesh1DRad.f90
+++ b/src/modules/mesh/1DRad/moduleMesh1DRad.f90
@@ -103,6 +103,7 @@ MODULE moduleMesh1DRad
     SUBROUTINE initEdge1DRad(self, n, p, ps)
       USE moduleSpecies, only:nSpecies
       USE moduleErrors
+      use moduleConstParam, only: pi4
       IMPLICIT NONE
 
       CLASS(meshEdge1DRad), INTENT(out):: self
@@ -121,7 +122,7 @@ MODULE moduleMesh1DRad
 
       self%r = r1(1)
 
-      self%surface = 1.D0
+      self%surface = pi4 * self%r**2
 
       self%normal = (/ 1.D0, 0.D0, 0.D0 /)