diff --git a/CONTRIBUTORS.md b/CONTRIBUTORS.md
index c1d9657..f3f5e3e 100644
--- a/CONTRIBUTORS.md
+++ b/CONTRIBUTORS.md
@@ -5,3 +5,4 @@
 | james-bruten-mo | James Bruten | Met Office | 2025-12-09 |
 | t00sa       | Sam Clarke-Green | Met Office | 2026-03-02 |
 | Pierre-siddall| Pierre Siddall | Met Office | 2026-03-11 |
+| iboutle       | Ian Boutle     | Met Office | 2026-08-12 |
diff --git a/src/activation.F90 b/src/activation.F90
index 3c2ec85..a0f8d85 100644
--- a/src/activation.F90
+++ b/src/activation.F90
@@ -261,14 +261,11 @@ subroutine activate(dt, cloud_mass, cloud_number, w, rho, dnumber, dmac, T, p,
 
         activated_arg = sum(dnccn_all(:))
 
+        dactive = zero_real_wp
+        dmass_d = zero_real_wp
         if (Smax_act > smax_act_min .and. .not. l_warm) then
 
-          if (iopt_inuc < 4) then
-            ! For lower-order ice nucleation options, need to initialise
-            ! dactive and dmass_d
-            dactive = zero_real_wp
-            dmass_d = zero_real_wp
-          else
+          if (iopt_inuc > 3) then
             ! For higher-order ice nucleation schemes, dactive and dmass_d
             ! can be based on dustphys
             dactive = 0.01*dustphys%N(1)