diff --git a/sdeconv/deconv/wiener.py b/sdeconv/deconv/wiener.py
index 63402a9..7b337b8 100644
--- a/sdeconv/deconv/wiener.py
+++ b/sdeconv/deconv/wiener.py
@@ -42,7 +42,7 @@ def laplacian_3d(shape: tuple[int, int]) -> torch.Tensor:
     image[z_c, y_c - 1, x_c] = -1
     image[z_c, y_c + 1, x_c] = -1
     image[z_c, y_c, x_c - 1] = -1
-    image[z_c, y_c, x_c - 1] = -1
+    image[z_c, y_c, x_c + 1] = -1
     return image