diff --git a/actix-http/Cargo.toml b/actix-http/Cargo.toml
index 79d7117b4..3b4378770 100644
--- a/actix-http/Cargo.toml
+++ b/actix-http/Cargo.toml
@@ -35,7 +35,7 @@ rust-tls = ["rustls", "webpki-roots", "actix-connect/rust-tls"]
 brotli = ["brotli2"]
 
 # miniz-sys backend for flate2 crate
-flate2-zlib = ["flate2/miniz-sys"]
+flate2-zlib = ["flate2/miniz-sys", "flate2/libc"]
 
 # rust backend for flate2 crate
 flate2-rust = ["flate2/rust_backend"]