diff --git a/homeassistant/util/__init__.py b/homeassistant/util/__init__.py
index 6d77f67161d..1186892b512 100644
--- a/homeassistant/util/__init__.py
+++ b/homeassistant/util/__init__.py
@@ -22,6 +22,9 @@ U = TypeVar('U')
 RE_SANITIZE_FILENAME = re.compile(r'(~|\.\.|/|\\)')
 RE_SANITIZE_PATH = re.compile(r'(~|\.(\.)+)')
 RE_SLUGIFY = re.compile(r'[^a-z0-9_]+')
+TBL_SLUGIFY = {
+    ord('ß'): 'ss'
+}
 
 
 def sanitize_filename(filename: str) -> str:
@@ -36,9 +39,13 @@ def sanitize_path(path: str) -> str:
 
 def slugify(text: str) -> str:
     """Slugify a given text."""
-    text = normalize('NFKD', text).lower().replace(" ", "_")
+    text = normalize('NFKD', text)
+    text = text.lower()
+    text = text.replace(" ", "_")
+    text = text.translate(TBL_SLUGIFY)
+    text = RE_SLUGIFY.sub("", text)
 
-    return RE_SLUGIFY.sub("", text)
+    return text
 
 
 def repr_helper(inp: Any) -> str:
diff --git a/tests/util/test_init.py b/tests/util/test_init.py
index 3ccb72920d4..ba8415d597f 100644
--- a/tests/util/test_init.py
+++ b/tests/util/test_init.py
@@ -37,6 +37,7 @@ class TestUtil(unittest.TestCase):
                          util.slugify("greg_phone - exp_wayp1"))
         self.assertEqual("we_are_we_are_a_test_calendar",
                          util.slugify("We are, we are, a... Test Calendar"))
+        self.assertEqual("test_aouss_aou", util.slugify("Tèst_äöüß_ÄÖÜ"))
 
     def test_repr_helper(self):
         """Test repr_helper."""