diff --git a/src/sampling/probes/patchProbes.H b/src/sampling/probes/patchProbes.H
index 8fb9db6304..5eb96c5e36 100644
--- a/src/sampling/probes/patchProbes.H
+++ b/src/sampling/probes/patchProbes.H
@@ -154,7 +154,7 @@ public:
     //- Public members
 
         //- Sample and write
-        virtual bool write(const bool postProcess);
+        virtual bool write(const bool postProcess = false);
 
         //- Read
         virtual bool read(const dictionary&);