diff --git a/tutorials/incompressible/potentialFreeSurfaceFoam/oscillatingBox/system/controlDict b/tutorials/incompressible/potentialFreeSurfaceFoam/oscillatingBox/system/controlDict
index 58d0742ace..841980b5d8 100644
--- a/tutorials/incompressible/potentialFreeSurfaceFoam/oscillatingBox/system/controlDict
+++ b/tutorials/incompressible/potentialFreeSurfaceFoam/oscillatingBox/system/controlDict
@@ -15,7 +15,7 @@ FoamFile
 }
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
-application potentialFreeSurfaceFoam;
+application     potentialFreeSurfaceFoam;
 
 startFrom       startTime;