diff --git a/tonic/src/codec/compression.rs b/tonic/src/codec/compression.rs
index b1a8b54b3..2e75ef4fc 100644
--- a/tonic/src/codec/compression.rs
+++ b/tonic/src/codec/compression.rs
@@ -47,7 +47,7 @@ impl EnabledCompressionEncodings {
         let mut value = BytesMut::new();
         for encoding in self.inner.into_iter().flatten() {
             value.put_slice(encoding.as_str().as_bytes());
-            value.put_slice(b",");
+            value.put_u8(b',');
         }
 
         if value.is_empty() {