diff --git a/sample/layman.map/internal_url_thumbnail.json b/sample/layman.map/internal_url_thumbnail.json
new file mode 100644
index 000000000..702adc99a
--- /dev/null
+++ b/sample/layman.map/internal_url_thumbnail.json
@@ -0,0 +1,49 @@
+{
+  "abstract": "World places and boundaries abstract",
+  "title": "World places and boundaries",
+  "extent": [
+    "-35.0",
+    "-48.5",
+    "179",
+    "81.5"
+  ],
+  "projection": "epsg:3857",
+  "layers": [
+    {
+      "metadata": {},
+      "visibility": true,
+      "opacity": 1,
+      "title": "Staty",
+      "className": "HSLayers.Layer.WMS",
+      "singleTile": true,
+      "url": "http://localhost:8000/geoserver/test_sld_style_applied_in_map_thumbnail_workspace_wms/ows",
+      "params": {
+        "LAYERS": "test_sld_style_applied_in_map_thumbnail_layer",
+        "FORMAT": "image\/png"
+      }
+    },
+    {
+      "metadata": {},
+      "visibility": true,
+      "opacity": 1,
+      "title": "Defini\u010dn\u00ed body administrativn\u00edch celk\u016f",
+      "className": "HSLayers.Layer.WMS",
+      "singleTile": true,
+      "wmsMaxScale": 0,
+      "legends": [
+        "https%3A%2F%2Fgeoportal.kraj-lbc.cz%2Fcgi-bin%2Fmapserv%3Fmap%3D%2Fdata%2Fgis%2FMapServer%2Fprojects%2Fwms%2Fatlas%2Fadministrativni_cleneni.map%26version%3D1.3.0%26service%3DWMS%26request%3DGetLegendGraphic%26sld_version%3D1.1.0%26layer%3Ddefinicni_body_administrativnich_celku%26format%3Dimage%2Fpng%26STYLE%3Ddefault"
+      ],
+      "maxResolution": null,
+      "minResolution": 0,
+      "url": "https%3A%2F%2Fgeoportal.kraj-lbc.cz%2Fcgi-bin%2Fmapserv%3Fmap%3D%2Fdata%2Fgis%2FMapServer%2Fprojects%2Fwms%2Fatlas%2Fadministrativni_cleneni.map%26",
+      "params": {
+        "LAYERS": "definicni_body_administrativnich_celku",
+        "INFO_FORMAT": "application\/vnd.ogc.gml",
+        "FORMAT": "image\/png",
+        "FROMCRS": "EPSG:3857",
+        "VERSION": "1.3.0"
+      },
+      "dimensions": {}
+    }
+  ]
+}
\ No newline at end of file
diff --git a/sample/style/test_sld_style_applied_in_map_thumbnail_map.png b/sample/style/test_sld_style_applied_in_map_thumbnail_map.png
new file mode 100644
index 000000000..0945606e2
Binary files /dev/null and b/sample/style/test_sld_style_applied_in_map_thumbnail_map.png differ
diff --git a/src/layman/map/filesystem/thumbnail_test.py b/src/layman/map/filesystem/thumbnail_test.py
new file mode 100644
index 000000000..7ed971e43
--- /dev/null
+++ b/src/layman/map/filesystem/thumbnail_test.py
@@ -0,0 +1,40 @@
+import pytest
+from layman import app
+from . import thumbnail
+from test import process_client, util
+
+
+headers_sld = {
+    'Accept': 'application/vnd.ogc.sld+xml',
+    'Content-type': 'application/xml',
+}
+
+
+@pytest.mark.usefixtures('ensure_layman')
+def test_sld_style_applied_in_map_thumbnail():
+    workspace = 'test_sld_style_applied_in_map_thumbnail_workspace'
+    layer = 'test_sld_style_applied_in_map_thumbnail_layer'
+    map = 'test_sld_style_applied_in_map_thumbnail_map'
+    geojson_file = ['/code/tmp/naturalearth/110m/cultural/ne_110m_admin_0_countries.geojson']
+    map_file = ['sample/layman.map/internal_url_thumbnail.json']
+    style_file = 'sample/style/generic-blue.xml'
+    expected_file = 'sample/style/test_sld_style_applied_in_map_thumbnail_map.png'
+
+    process_client.publish_layer(workspace,
+                                 layer,
+                                 file_paths=geojson_file,
+                                 style_file=style_file)
+
+    process_client.publish_map(workspace,
+                               map,
+                               file_paths=map_file)
+
+    with app.app_context():
+        thumbnail_path = thumbnail.get_map_thumbnail_path(workspace, map)
+
+    diffs = util.compare_images(expected_file, thumbnail_path)
+
+    assert diffs < 1000
+
+    process_client.delete_map(workspace, map)
+    process_client.delete_layer(workspace, layer)