diff --git a/src/cellmapper/model/kernel.py b/src/cellmapper/model/kernel.py
index 235cece..c70a116 100644
--- a/src/cellmapper/model/kernel.py
+++ b/src/cellmapper/model/kernel.py
@@ -273,7 +273,7 @@ def compute_kernel_matrix(
             if kernel_method == "jaccard":
                 kernel_matrix.data /= 4 * n_neighbors - kernel_matrix.data
             elif kernel_method == "hnoca":
-                kernel_matrix.data /= 2 * n_neighbors - kernel_matrix.data
+                kernel_matrix.data /= 4 * n_neighbors - kernel_matrix.data
                 kernel_matrix.data = kernel_matrix.data**2
 
         elif kernel_method in PackageConstants.CONNECTIVITY_BASED_KERNELS: