diff --git a/src/lagrangian/intermediate/submodels/Kinematic/InjectionModel/ManualInjection/ManualInjection.C b/src/lagrangian/intermediate/submodels/Kinematic/InjectionModel/ManualInjection/ManualInjection.C
index afcd15f30308226ed2f1d48d3a2f11b78639fc39..3177b78c3180b0afcb8e835552859da7df153a0f 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;
 }