diff --git a/applications/utilities/postProcessing/sampling/sample/sampleDict b/applications/utilities/postProcessing/sampling/sample/sampleDict
index ba3dee7dfd..fbe33f1815 100644
--- a/applications/utilities/postProcessing/sampling/sample/sampleDict
+++ b/applications/utilities/postProcessing/sampling/sample/sampleDict
@@ -141,6 +141,7 @@ sets
     patchSeed
     {
         type        patchSeed;
+        axis        xyz;
         patches     (".*Wall.*");
         // Number of points to seed. Divided amongst all processors according
         // to fraction of patches they hold.