diff --git a/tokio/Cargo.toml b/tokio/Cargo.toml
index 4edbd25ea8d..12f8332307d 100644
--- a/tokio/Cargo.toml
+++ b/tokio/Cargo.toml
@@ -109,7 +109,7 @@ tracing = { version = "0.1.29", default-features = false, features = ["std"], op
 backtrace = { version = "0.3.58" }
 
 [target.'cfg(unix)'.dependencies]
-libc = { version = "0.2.149", optional = true }
+libc = { version = "=0.2.149", optional = true }
 signal-hook-registry = { version = "1.1.1", optional = true }
 
 [target.'cfg(unix)'.dev-dependencies]