diff --git a/Cargo.toml b/Cargo.toml
index 79e4862..86f2076 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -20,9 +20,11 @@ filetime = "0.1"
 getopts = "0.2"
 log = "0.3"
 rustc-serialize = "0.3"
-libc = "0.2"
 tempdir = { version = "0.3", optional = true }
 
+[target."cfg(unix)".dependencies]
+libc = "0.2"
+
 [target."cfg(windows)".dependencies]
 miow = "0.2"
 winapi = "0.2"