diff --git a/projects/clr/hipamd/include/hip/amd_detail/amd_hip_cooperative_groups_reduce.h b/projects/clr/hipamd/include/hip/amd_detail/amd_hip_cooperative_groups_reduce.h
index bdcacd4274f3..92d93b9892b9 100644
--- a/projects/clr/hipamd/include/hip/amd_detail/amd_hip_cooperative_groups_reduce.h
+++ b/projects/clr/hipamd/include/hip/amd_detail/amd_hip_cooperative_groups_reduce.h
@@ -130,7 +130,7 @@ __CG_QUALIFIER__ auto reduce(const TyGroup& group, TyVal&& val, TyFn&& op) -> de
   // threads at a time; we need to mask away the threads that not part of this tile first
   if constexpr (!__hip_internal::is_same<TyGroup, cooperative_groups::coalesced_group>::value) {
     mask >>= (64 - group.num_threads());
-    mask <<= (((threadIdx.x % warpSize) / group.num_threads()) * group.num_threads());
+    mask <<= (((internal::workgroup::thread_rank() % warpSize) / group.num_threads()) * group.num_threads());
   }
 
   // for coalesced_groups, the mask is simply the activemask
diff --git a/projects/hip-tests/catch/config/configs/unit/cooperativeGrps.yaml b/projects/hip-tests/catch/config/configs/unit/cooperativeGrps.yaml
index 8df088707f18..413cee6b949e 100644
--- a/projects/hip-tests/catch/config/configs/unit/cooperativeGrps.yaml
+++ b/projects/hip-tests/catch/config/configs/unit/cooperativeGrps.yaml
@@ -250,3 +250,7 @@ cooperativeGrps:
     <<: *level_2
     # Rock_Window_Failures_on_gfx1151
     disabled: [amd_windows, amd_wsl]
+  Unit_Thread_Block_Tile_Multi_Dimensional_Reduce:
+    <<: *level_2
+    # Rock_Window_Failures_on_gfx1151
+    disabled: [amd_windows, amd_wsl]
diff --git a/projects/hip-tests/catch/unit/cooperativeGrps/thread_block_tile.cc b/projects/hip-tests/catch/unit/cooperativeGrps/thread_block_tile.cc
index c0231d482944..f36fb24808fe 100644
--- a/projects/hip-tests/catch/unit/cooperativeGrps/thread_block_tile.cc
+++ b/projects/hip-tests/catch/unit/cooperativeGrps/thread_block_tile.cc
@@ -1043,7 +1043,55 @@ HIP_TEMPLATE_TEST_CASE(Unit_Thread_Block_Coalesced_Reduce_boolean, int, unsigned
   } else {
     runReduceRandomForOps<true, TestType, 64>(ops);
   }
-} 
+}
+
+__global__ void multiDimReduce(int* output)
+{
+  cg::thread_block mygroup = cg::this_thread_block();
+  auto mytile = cg::tiled_partition<16>(mygroup);
+  int tid = threadIdx.x + threadIdx.y * blockDim.x + threadIdx.z * blockDim.x * blockDim.y;
+
+  output[tid] = cooperative_groups::reduce(mytile, tid, cooperative_groups::plus<int>());
+}
+
+// test tiles reduces on multidimensional blocks. Basically splits the 128 threads in the block
+// into 16 threads tiles, each one contributing the tid to their reduces
+HIP_TEST_CASE(Unit_Thread_Block_Tile_Multi_Dimensional_Reduce)
+{
+  LinearAllocGuard<int> h_result(LinearAllocs::malloc, sizeof(int) * 128);
+  LinearAllocGuard<int> d_result(LinearAllocs::hipMalloc, h_result.size_bytes());
+  dim3 gridDim = { 1 };
+  // use a block size bigger than the warp size
+  dim3 blockDim = { 16, 4, 2 };
+  void* devicePtr = d_result.ptr();
+  void* args[1] = { &devicePtr };
+  hipError_t status;
+
+  status = hipLaunchCooperativeKernel(multiDimReduce,
+                                      gridDim,
+                                      blockDim,
+                                      args,
+                                      0,
+                                      nullptr);
+  HIP_CHECK(status);
+  HIP_CHECK(hipDeviceSynchronize());
+  HIP_CHECK(hipGetLastError());
+  HIP_CHECK(hipMemcpy(h_result.host_ptr(), d_result.ptr(),
+                      h_result.size_bytes(), hipMemcpyDeviceToHost));
+
+  for (int row = 0; row < 8; row++) {
+    int rowResult = 0;
+
+    for (int index = 0; index < 16; index++) {
+      rowResult += row * 16 + index;
+    }
+
+    for (int index = 0; index < 16; index++) {
+      INFO("row: " << row << " index: " << index);
+      REQUIRE(h_result.host_ptr()[row * 16 + index] == rowResult);
+    }
+  }
+}
 
 /**
  * End doxygen group DeviceLanguageTest.