diff --git a/actix-http/src/encoding/decoder.rs b/actix-http/src/encoding/decoder.rs
index 1a48f2a2e24..370ba48656f 100644
--- a/actix-http/src/encoding/decoder.rs
+++ b/actix-http/src/encoding/decoder.rs
@@ -40,10 +40,13 @@ where
     /// Construct a decoder.
     #[inline]
     pub fn new(stream: S, encoding: ContentEncoding) -> Decoder<S> {
+        #[cfg(feature = "compress-brotli")]
+        const DEFAULT_DECODER_CAPACITY: usize = 8 * 1024; // 8 KiB
+
         let decoder = match encoding {
             #[cfg(feature = "compress-brotli")]
             ContentEncoding::Brotli => Some(ContentDecoder::Brotli(Box::new(
-                brotli::DecompressorWriter::new(Writer::new(), 8_096),
+                brotli::DecompressorWriter::new(Writer::new(), DEFAULT_DECODER_CAPACITY),
             ))),
 
             #[cfg(feature = "compress-gzip")]