diff --git a/codegen/tests/compiletest.rs b/codegen/tests/compiletest.rs
index 6e604fca..c772a49d 100644
--- a/codegen/tests/compiletest.rs
+++ b/codegen/tests/compiletest.rs
@@ -10,11 +10,18 @@ pub fn run(mode: Mode) {
     config.mode = mode;
     config.src_base = PathBuf::from(format!("tests/{}", mode));
 
+    #[cfg(debug_assertions)]
     let flags = [
         "-L crate=../target/debug/",
         "-L dependency=../target/debug/deps/",
     ].join(" ");
 
+    #[cfg(not(debug_assertions))]
+    let flags = [
+        "-L crate=../target/release/",
+        "-L dependency=../target/release/deps/",
+    ].join(" ");
+
     config.target_rustcflags = Some(flags);
     run_tests(&config);
 }