diff --git a/lib/reel/response.rb b/lib/reel/response.rb
index 4ac7f25..b734eeb 100644
--- a/lib/reel/response.rb
+++ b/lib/reel/response.rb
@@ -36,7 +36,7 @@ def initialize(status, body_or_headers = nil, body = nil)
       else raise TypeError, "can't render #{@body.class} as a response body"
       end
 
-      @headers = HTTP::Headers.from_hash(headers)
+      @headers = HTTP::Headers.coerce(headers)
       @version = http_version
     end
 
diff --git a/lib/reel/stream.rb b/lib/reel/stream.rb
index 223ee1a..99fcad4 100644
--- a/lib/reel/stream.rb
+++ b/lib/reel/stream.rb
@@ -102,7 +102,7 @@ def initialize(status, headers, body)
         raise TypeError, "can't render #{@body.class} as a response body"
       end
 
-      @headers = HTTP::Headers.from_hash(headers)
+      @headers = HTTP::Headers.coerce(headers)
       @version = http_version
     end