diff --git a/librespot/audio/__init__.py b/librespot/audio/__init__.py
index 423c59c..97c9282 100644
--- a/librespot/audio/__init__.py
+++ b/librespot/audio/__init__.py
@@ -578,6 +578,8 @@ class CdnManager:
             response = self.request(range_start=0,
                                     range_end=ChannelManager.chunk_size - 1)
             content_range = response.headers.get("Content-Range")
+            if content_range is None:
+                content_range = response.headers.get("content-range")
             if content_range is None:
                 raise IOError("Missing Content-Range header!")
             split = content_range.split("/")