diff --git a/.coverage b/.coverage
index 5925e174..d3bbacbc 100644
Binary files a/.coverage and b/.coverage differ
diff --git a/io_mesh_w3d/common/utils/material_export.py b/io_mesh_w3d/common/utils/material_export.py
index 3193a539..7ac4f08a 100644
--- a/io_mesh_w3d/common/utils/material_export.py
+++ b/io_mesh_w3d/common/utils/material_export.py
@@ -138,8 +138,11 @@ def retrieve_shader_material(context, material, principled, w3x=False):
         append_property(shader_mat, 1, 'DiffuseTexture', principled.base_color_texture)
 
     append_property(shader_mat, 1, 'NormalMap', principled.normalmap_texture)
-    if principled.normalmap_texture is not None:
+    if principled.normalmap_texture is not None and principled.normalmap_texture.image is not None:
+        if shader_mat.header.type_name == 'DefaultW3D.fx':
+            shader_mat.header.type_name = 'NormalMapped.fx'
         append_property(shader_mat, 2, 'BumpScale', principled.normalmap_strength, 1.0)
+
     append_property(shader_mat, 1, 'SpecMap', principled.specular_texture)
     append_property(shader_mat, 7, 'CullingEnable', material.use_backface_culling)
     append_property(shader_mat, 2, 'Opacity', material.opacity)
diff --git a/tests/common/cases/test_utils.py b/tests/common/cases/test_utils.py
index 8ca664bf..1fc7ee35 100644
--- a/tests/common/cases/test_utils.py
+++ b/tests/common/cases/test_utils.py
@@ -144,6 +144,7 @@ def test_shader_material_type_name_fallback(self):
 
         for source in mesh.shader_materials:
             source.header.type_name = 'LoremIpsum'
+            source.properties = []
 
             (material, principled) = create_material_from_shader_material(
                 self, mesh.name(), source)
@@ -151,6 +152,18 @@ def test_shader_material_type_name_fallback(self):
             source.header.type_name = 'DefaultW3D.fx'
             compare_shader_materials(self, source, actual)
 
+    def test_shader_material_type_name_upgrade_to_normal_mapped(self):
+        mesh = get_mesh(shader_mats=True)
+
+        for source in mesh.shader_materials:
+            source.header.type_name = 'LoremIpsum'
+
+            (material, principled) = create_material_from_shader_material(
+                self, mesh.name(), source)
+            actual = retrieve_shader_material(self, material, principled)
+            source.header.type_name = 'NormalMapped.fx'
+            compare_shader_materials(self, source, actual)
+
     def test_shader_roundtrip(self):
         mesh = get_mesh()