diff --git a/tutorials/mesh/snappyHexMesh/Allrun b/tutorials/mesh/snappyHexMesh/Allrun
index d37c93a33d..aeac877153 100755
--- a/tutorials/mesh/snappyHexMesh/Allrun
+++ b/tutorials/mesh/snappyHexMesh/Allrun
@@ -12,6 +12,11 @@ cd ${0%/*} || exit 1    # Run from this directory
     ./Allrun
 )
 
+(
+    cd gap_detection || exit
+    ./Allrun
+)
+
 exit 0
 
 # These cases are links to solver test cases and are run when the Allrun