diff --git a/build.rs b/build.rs
index 4187f26..b8cf7c1 100644
--- a/build.rs
+++ b/build.rs
@@ -1,5 +1,5 @@
 fn main() -> Result<(), Box<dyn std::error::Error>> {
-    let s = std::fs::read_to_string("./cargo.lock")?;
+    let s = std::fs::read_to_string(std::env::var("CARGO_MANIFEST_DIR")? + "/cargo.lock")?;
     let lock = s.parse::<toml::Value>().unwrap();
     let mut reqwest_ver: Option<String> = None;
     for p in lock.as_table().unwrap()["package"].as_array().unwrap() {