diff --git a/Cargo.toml b/Cargo.toml
index af003fd3368073b1cfb40c99dee92f8b439fe8e3..d8d0aa6638325d218770e4c984f438270fa3b5c1 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -16,6 +16,7 @@ platform = { path = "platform" }
 ctype = { path = "src/ctype" }
 fcntl = { path = "src/fcntl" }
 grp = { path = "src/grp" }
+semaphore = { path = "src/semaphore" }
 stdio = { path = "src/stdio" }
 stdlib = { path = "src/stdlib" }
 string = { path = "src/string" }