diff --git a/Cargo.toml b/Cargo.toml
index 124afaa3d..8c3065fb1 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -27,7 +27,7 @@ curl-sys = "0.4.15"
 env_logger = "0.6.0"
 failure = "0.1.2"
 filetime = "0.2"
-flate2 = "1.0.3"
+flate2 = { version = "1.0.3", features = ['zlib'] }
 fs2 = "0.4"
 git2 = "0.7.5"
 git2-curl = "0.8.1"