diff --git a/Python/PY_NTNDA_Viewer/numpyImage.py b/Python/PY_NTNDA_Viewer/numpyImage.py
index d6ff533..8f666f2 100644
--- a/Python/PY_NTNDA_Viewer/numpyImage.py
+++ b/Python/PY_NTNDA_Viewer/numpyImage.py
@@ -371,7 +371,7 @@ def plot3d(self, image):
             image = image[yoffset:ny, xoffset:nx]
             image = np.transpose(image)
             fig = plt.figure()
-            ax = fig.gca(projection="3d")
+            ax = fig.add_subplot(111, projection="3d")
             ax.set_xlabel("x")
             ax.set_ylabel("y")
             ax.set_zlabel("value")