diff --git a/etc/templates/inflowOutflow/system/snappyHexMeshDict b/etc/templates/inflowOutflow/system/snappyHexMeshDict
index 0f0e888037..7c1659090c 100644
--- a/etc/templates/inflowOutflow/system/snappyHexMeshDict
+++ b/etc/templates/inflowOutflow/system/snappyHexMeshDict
@@ -53,13 +53,21 @@ castellatedMeshControls
                 <inletPatch>
                 {
                     level (2 2);
-                    patchInfo { type patch; }
+                    patchInfo
+                    {
+                        type patch;
+                        inGroups (inlet);
+                    }
                 }
 
                 <outletPatch>
                 {
                     level (2 2);
-                    patchInfo { type patch; }
+                    patchInfo
+                    {
+                        type patch;
+                        inGroups (outlet);
+                    }
                 }
             }
         }
diff --git a/etc/templates/inflowOutflowRotating/system/snappyHexMeshDict b/etc/templates/inflowOutflowRotating/system/snappyHexMeshDict
index c5264154d6..dfcd05a870 100644
--- a/etc/templates/inflowOutflowRotating/system/snappyHexMeshDict
+++ b/etc/templates/inflowOutflowRotating/system/snappyHexMeshDict
@@ -66,13 +66,21 @@ castellatedMeshControls
                 <inletPatch>
                 {
                     level (2 2);
-                    patchInfo { type patch; }
+                    patchInfo
+                    {
+                        type patch;
+                        inGroups (inlet);
+                    }
                 }
 
                 <outletPatch>
                 {
                     level (2 2);
-                    patchInfo { type patch; }
+                    patchInfo
+                    {
+                        type patch;
+                        inGroups (outlet);
+                    }
                 }
             }
         }