diff --git a/cargo/cargo_build_script_runner/bin.rs b/cargo/cargo_build_script_runner/bin.rs
index 04d89a34d9..baee4ff724 100644
--- a/cargo/cargo_build_script_runner/bin.rs
+++ b/cargo/cargo_build_script_runner/bin.rs
@@ -89,7 +89,7 @@ fn run_buildrs() -> Result<(), String> {
     }
 
     if let Some(cc_path) = env::var_os("CC") {
-        let mut cc_path = exec_root.join(cc_path);
+        let mut cc_path = exec_root.join(cc_path).into_os_string();
         if let Some(sysroot_path) = env::var_os("SYSROOT") {
             cc_path.push(" --sysroot=");
             cc_path.push(&exec_root.join(sysroot_path));