diff --git a/rust/logos-blockchain-circuits-poq-sys/build.rs b/rust/logos-blockchain-circuits-poq-sys/build.rs
index 0914b60..ff836eb 100644
--- a/rust/logos-blockchain-circuits-poq-sys/build.rs
+++ b/rust/logos-blockchain-circuits-poq-sys/build.rs
@@ -3,7 +3,7 @@ use ureq::Body;
 use ureq::http::Response;
 
 static CIRCUIT_NAME: &str = "poq";
-static LIB_VAR_NAME: &str = "POQ_LIB_DIR";
+static LIB_VAR_NAME: &str = "LBC_POQ_LIB_DIR";
 
 
 fn get_artifact_name(version: &str, os: &str, arch: &str) -> String {
diff --git a/rust/logos-blockchain-circuits-poq-sys/src/native.rs b/rust/logos-blockchain-circuits-poq-sys/src/native.rs
index b6b2260..52597a2 100644
--- a/rust/logos-blockchain-circuits-poq-sys/src/native.rs
+++ b/rust/logos-blockchain-circuits-poq-sys/src/native.rs
@@ -60,9 +60,10 @@ mod tests {
     use super::{generate_witness, generate_witness_from_files};
 
     static LIB_DIR: LazyLock<PathBuf> = LazyLock::new(|| {
+        const ENV_VAR: &str = "LBC_POQ_LIB_DIR";
         PathBuf::from(
-            std::env::var("POQ_LIB_DIR")
-                .expect("POQ_LIB_DIR must be available, as provided by the build script."),
+            std::env::var(ENV_VAR)
+                .expect(format!("Environment variable '{ENV_VAR}' must be available, as provided by the build script.").as_str()),
         )
     });
     static INPUTS: LazyLock<PathBuf> = LazyLock::new(|| {