diff --git a/homeassistant/components/ssdp/__init__.py b/homeassistant/components/ssdp/__init__.py
index 3be5475a71a..986eabf4e82 100644
--- a/homeassistant/components/ssdp/__init__.py
+++ b/homeassistant/components/ssdp/__init__.py
@@ -606,7 +606,7 @@ def discovery_info_from_headers_and_description(
 ) -> SsdpServiceInfo:
     """Convert headers and description to discovery_info."""
     ssdp_usn = combined_headers["usn"]
-    ssdp_st = combined_headers.get("st")
+    ssdp_st = combined_headers.get_lower("st")
     if isinstance(info_desc, CaseInsensitiveDict):
         upnp_info = {**info_desc.as_dict()}
     else:
@@ -626,11 +626,11 @@ def discovery_info_from_headers_and_description(
     return SsdpServiceInfo(
         ssdp_usn=ssdp_usn,
         ssdp_st=ssdp_st,
-        ssdp_ext=combined_headers.get("ext"),
-        ssdp_server=combined_headers.get("server"),
-        ssdp_location=combined_headers.get("location"),
-        ssdp_udn=combined_headers.get("_udn"),
-        ssdp_nt=combined_headers.get("nt"),
+        ssdp_ext=combined_headers.get_lower("ext"),
+        ssdp_server=combined_headers.get_lower("server"),
+        ssdp_location=combined_headers.get_lower("location"),
+        ssdp_udn=combined_headers.get_lower("_udn"),
+        ssdp_nt=combined_headers.get_lower("nt"),
         ssdp_headers=combined_headers,
         upnp=upnp_info,
     )