diff --git a/openssl-sys/Cargo.toml b/openssl-sys/Cargo.toml
index 3b6dc5fb..847b8558 100644
--- a/openssl-sys/Cargo.toml
+++ b/openssl-sys/Cargo.toml
@@ -17,6 +17,9 @@ tlsv1_1 = []
 sslv2 = []
 aes_xts = []
 
+[dependencies]
+libc = "0.1"
+
 [build-dependencies]
 pkg-config = "0.3"
 gcc = "0.3"
diff --git a/openssl-sys/src/lib.rs b/openssl-sys/src/lib.rs
index 92d88052..6801d053 100644
--- a/openssl-sys/src/lib.rs
+++ b/openssl-sys/src/lib.rs
@@ -1,6 +1,6 @@
 #![allow(non_camel_case_types, non_upper_case_globals, non_snake_case)]
 #![allow(dead_code)]
-#![feature(core, old_io, libc, old_path, std_misc, env)]
+#![feature(core, old_io, old_path, std_misc, env)]
 #![doc(html_root_url="https://sfackler.github.io/rust-openssl/doc/openssl-sys")]
 
 extern crate libc;
diff --git a/openssl/Cargo.toml b/openssl/Cargo.toml
index 9fbfdcbc..62e6d33d 100644
--- a/openssl/Cargo.toml
+++ b/openssl/Cargo.toml
@@ -19,5 +19,8 @@ aes_xts = ["openssl-sys/aes_xts"]
 path = "../openssl-sys"
 version = "0.4.3"
 
+[dependencies]
+libc = "0.1"
+
 [dev-dependencies]
 rustc-serialize = "0.2"
diff --git a/openssl/src/lib.rs b/openssl/src/lib.rs
index 77b6313c..56720ae2 100644
--- a/openssl/src/lib.rs
+++ b/openssl/src/lib.rs
@@ -1,4 +1,4 @@
-#![feature(unsafe_destructor, core, old_io, std_misc, libc, old_path)]
+#![feature(unsafe_destructor, core, old_io, std_misc, old_path)]
 #![doc(html_root_url="https://sfackler.github.io/rust-openssl/doc/openssl")]
 
 extern crate libc;