diff --git a/Cargo.toml b/Cargo.toml
index 2a1462a..c967724 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -19,3 +19,6 @@ rustc_version = "0.2"
 [features]
 default = []
 no_std = []
+
+# for tests
+no_unwind_protection = []
diff --git a/build.rs b/build.rs
index 87254ce..5785197 100644
--- a/build.rs
+++ b/build.rs
@@ -25,6 +25,7 @@ fn build_tramp()
 fn main() {
     // Assert we haven't travelled back in time
     assert!(version().unwrap().major >= 1);
+    println!("cargo::rustc-check-cfg=cfg(nightly)");
 
     // Set cfg flags depending on release channel
     match version_meta().unwrap().channel {