diff --git a/src/lagrangian/intermediate/submodels/Kinematic/InjectionModel/ManualInjection/ManualInjection.C b/src/lagrangian/intermediate/submodels/Kinematic/InjectionModel/ManualInjection/ManualInjection.C
index afcd15f303..3177b78c31 100644
--- a/src/lagrangian/intermediate/submodels/Kinematic/InjectionModel/ManualInjection/ManualInjection.C
+++ b/src/lagrangian/intermediate/submodels/Kinematic/InjectionModel/ManualInjection/ManualInjection.C
@@ -105,8 +105,7 @@ Foam::ManualInjection<CloudType>::ManualInjection
     }
 
     // Determine volume of particles to inject
-    this->volumeTotal_ = sum(pow(diameters_, 3))
-        *mathematicalConstant::pi/6.0;
+    this->volumeTotal_ = sum(pow3(diameters_))*mathematicalConstant::pi/6.0;
 }