diff --git a/src/gray_project.f90 b/src/gray_project.f90
index 74e51c0..4cb4b19 100644
--- a/src/gray_project.f90
+++ b/src/gray_project.f90
@@ -269,7 +269,7 @@ contains
     end if
 
     ! Signal that J_φ has alternating sign
-    if ((I_tot - abs(sum(J_phi*self%dA)))/ I_tot > 0.1) then
+    if (I_tot - abs(sum(J_phi*self%dA)) > 0.1_wp_*I_tot) then
       rho_avg_J  = -rho_avg_J
       drho_avg_J = -drho_avg_J
       rho_max_J  = -rho_max_J