diff --git a/lib/response.ts b/lib/response.ts
index 15bafc8..db3c494 100644
--- a/lib/response.ts
+++ b/lib/response.ts
@@ -84,9 +84,11 @@ export class Response extends Body
 		{
 			const contentType = headers.get( HTTP2_HEADER_CONTENT_TYPE );
 			const contentLength = headers.get( HTTP2_HEADER_CONTENT_LENGTH );
+			const contentEncoding =
+				headers.get( HTTP2_HEADER_CONTENT_ENCODING );
 
 			const length =
-				contentLength == null
+				( contentLength == null || contentEncoding != null )
 				? null
 				: parseInt( contentLength, 10 );
 
diff --git a/test/fetch-h2/nghttp2.org.ts b/test/fetch-h2/nghttp2.org.ts
index a8463c9..45cf852 100644
--- a/test/fetch-h2/nghttp2.org.ts
+++ b/test/fetch-h2/nghttp2.org.ts
@@ -136,4 +136,11 @@ describe( "nghttp2.org/httpbin", function( )
 
 		await disconnectAll( );
 	} );
+
+	it( "should be possible to GET gzip data", async ( ) =>
+	{
+		const response = await fetch( "https://nghttp2.org/httpbin/gzip" );
+		const data = await response.json( );
+		expect( data ).to.deep.include( { gzipped: true, method: "GET" } );
+	} );
 } );