diff --git a/libafl/Cargo.toml b/libafl/Cargo.toml
index 930383d93a..3c820ec845 100644
--- a/libafl/Cargo.toml
+++ b/libafl/Cargo.toml
@@ -30,7 +30,7 @@ llmp_debug = [] # Enables debug output for LLMP
 llmp_small_maps = [] # reduces initial map size for llmp
 
 [build-dependencies]
-rustc_version = "0.4"
+rustversion = "1.0"
 
 [dev-dependencies]
 criterion = "0.3" # Benchmarking
diff --git a/libafl/build.rs b/libafl/build.rs
new file mode 100644
index 0000000000..e9d3f5d9e9
--- /dev/null
+++ b/libafl/build.rs
@@ -0,0 +1,7 @@
+#[rustversion::nightly]
+fn main() {
+    println!("cargo:rustc-cfg=unstable_feature");
+}
+
+#[rustversion::not(nightly)]
+fn main() {}
diff --git a/libafl/src/lib.rs b/libafl/src/lib.rs
index 8717b14d92..8ce8d7df4e 100644
--- a/libafl/src/lib.rs
+++ b/libafl/src/lib.rs
@@ -3,7 +3,7 @@ Welcome to `LibAFL`
 */
 
 #![cfg_attr(not(feature = "std"), no_std)]
-#![cfg_attr(feature = "RUSTC_IS_NIGHTLY", feature(min_specialization))]
+#![cfg_attr(unstable_feature, feature(specialization))]
 #![deny(rustdoc::broken_intra_doc_links)]
 #![deny(clippy::pedantic)]
 #![allow(