diff --git a/src/KOKKOS/domain_kokkos.cpp b/src/KOKKOS/domain_kokkos.cpp
index 50ba6cc280..8408957ff9 100644
--- a/src/KOKKOS/domain_kokkos.cpp
+++ b/src/KOKKOS/domain_kokkos.cpp
@@ -67,6 +67,17 @@ public:
     dst.value[2][1] = MAX(dst.value[2][1],src.value[2][1]);
   }
 
+  KOKKOS_INLINE_FUNCTION
+  void join(volatile value_type &dst,
+             const volatile value_type &src) const {
+    dst.value[0][0] = MIN(dst.value[0][0],src.value[0][0]);
+    dst.value[0][1] = MAX(dst.value[0][1],src.value[0][1]);
+    dst.value[1][0] = MIN(dst.value[1][0],src.value[1][0]);
+    dst.value[1][1] = MAX(dst.value[1][1],src.value[1][1]);
+    dst.value[2][0] = MIN(dst.value[2][0],src.value[2][0]);
+    dst.value[2][1] = MAX(dst.value[2][1],src.value[2][1]);
+  }
+
   KOKKOS_INLINE_FUNCTION
   void operator() (const int &i, value_type &dst) const {
     dst.value[0][0] = MIN(dst.value[0][0],x(i,0));