diff --git a/substrate/core/executor/wasm/src/lib.rs b/substrate/core/executor/wasm/src/lib.rs
index 58759b2a469c2147b07173220574528266acbe19..b2e795182cb92c2f1ea499d293e4c2173bb271b2 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 9214a7aa37b98cc2cc2bde89d0e9b727f1a0263b..d5e465fca000e389b179e63b067a5b6516e3b0fd 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 caaba845dddb39258800018266341eee00ce9ceb..7b6dc67feb28b3720ff6011c2ebce608afbc2396 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 77573d73f4b5c8cd170f6a91abf0892152b5a2f3..120a72da5c1c933f8e1a0e72daf60e49e4815059 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))]