diff --git a/src/functionObjects/field/wallHeatFlux/wallHeatFlux.C b/src/functionObjects/field/wallHeatFlux/wallHeatFlux.C
index ad9e4d832c..dcb4c5c7ff 100644
--- a/src/functionObjects/field/wallHeatFlux/wallHeatFlux.C
+++ b/src/functionObjects/field/wallHeatFlux/wallHeatFlux.C
@@ -122,6 +122,8 @@ Foam::functionObjects::wallHeatFlux::wallHeatFlux
     mesh_.objectRegistry::store(wallHeatFluxPtr);
 
     read(dict);
+
+    writeFileHeader(file());
 }