diff --git a/src/sampling/sampledSurface/writers/nastran/nastranSurfaceWriterTemplates.C b/src/sampling/sampledSurface/writers/nastran/nastranSurfaceWriterTemplates.C
index fc0a283d75..fe1e6a998a 100644
--- a/src/sampling/sampledSurface/writers/nastran/nastranSurfaceWriterTemplates.C
+++ b/src/sampling/sampledSurface/writers/nastran/nastranSurfaceWriterTemplates.C
@@ -201,6 +201,7 @@ void Foam::nastranSurfaceWriter::writeTemplate
                 {
                     v += values[f[fptI]];
                 }
+                v /= f.size();
 
                 writeFaceValue(nasFieldName, v, ++n, os);
             }