diff --git a/substrate/core/executor/wasm/src/lib.rs b/substrate/core/executor/wasm/src/lib.rs
index 58759b2a46..b2e795182c 100644
--- a/substrate/core/executor/wasm/src/lib.rs
+++ b/substrate/core/executor/wasm/src/lib.rs
@@ -1,5 +1,4 @@
 #![no_std]
-#![feature(panic_handler)]
 #![cfg_attr(feature = "strict", deny(warnings))]
 
 #![feature(alloc)]
diff --git a/substrate/core/sr-io/src/lib.rs b/substrate/core/sr-io/src/lib.rs
index 9214a7aa37..d5e465fca0 100644
--- a/substrate/core/sr-io/src/lib.rs
+++ b/substrate/core/sr-io/src/lib.rs
@@ -20,7 +20,6 @@
 
 #![cfg_attr(not(feature = "std"), no_std)]
 #![cfg_attr(not(feature = "std"), feature(lang_items))]
-#![cfg_attr(not(feature = "std"), feature(panic_handler))]
 #![cfg_attr(not(feature = "std"), feature(alloc_error_handler))]
 #![cfg_attr(not(feature = "std"), feature(core_intrinsics))]
 #![cfg_attr(not(feature = "std"), feature(alloc))]
diff --git a/substrate/core/sr-sandbox/src/lib.rs b/substrate/core/sr-sandbox/src/lib.rs
index caaba845dd..7b6dc67feb 100755
--- a/substrate/core/sr-sandbox/src/lib.rs
+++ b/substrate/core/sr-sandbox/src/lib.rs
@@ -39,7 +39,6 @@
 
 #![warn(missing_docs)]
 #![cfg_attr(not(feature = "std"), no_std)]
-#![cfg_attr(not(feature = "std"), feature(panic_handler))]
 #![cfg_attr(not(feature = "std"), feature(core_intrinsics))]
 #![cfg_attr(not(feature = "std"), feature(alloc))]
 
diff --git a/substrate/core/sr-std/src/lib.rs b/substrate/core/sr-std/src/lib.rs
index 77573d73f4..120a72da5c 100644
--- a/substrate/core/sr-std/src/lib.rs
+++ b/substrate/core/sr-std/src/lib.rs
@@ -20,7 +20,6 @@
 // end::description[]
 
 #![cfg_attr(not(feature = "std"), no_std)]
-#![cfg_attr(not(feature = "std"), feature(panic_handler))]
 #![cfg_attr(not(feature = "std"), feature(core_intrinsics))]
 #![cfg_attr(not(feature = "std"), feature(alloc))]