diff --git a/Cargo.toml b/Cargo.toml
index 4529b7b..c6552ea 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -55,6 +55,7 @@ enum-map = "~2.0.1"
 futures-timer = "3.0.2"
 hostname = "0.3.1"
 ipnet = "2.3.1"
+libc = "0.2.146"
 log = "0.4.14"
 murmur3 = "0.5.1"
 rand = "0.8.4"
diff --git a/src/version.rs b/src/version.rs
index faf3af0..0462a2d 100644
--- a/src/version.rs
+++ b/src/version.rs
@@ -1,7 +1,7 @@
 use std::env;
 
 // include version into the binary at compile time
-pub fn get_sdk_version() -> &'static str {
+pub(crate) fn get_sdk_version() -> &'static str {
     concat!("unleash-client-rust:", env!("CARGO_PKG_VERSION"))
 }