diff --git a/primitives/account/src/lib.rs b/primitives/account/src/lib.rs
index b1f1588dcb..d2263aa25d 100644
--- a/primitives/account/src/lib.rs
+++ b/primitives/account/src/lib.rs
@@ -44,7 +44,8 @@ pub struct AccountId20(pub [u8; 20]);
 #[cfg(feature = "serde")]
 impl_serde::impl_fixed_hash_serde!(AccountId20, 20);
 
-impl core::str::FromStr for AccountId20 {
+#[cfg(feature = "std")]
+impl std::str::FromStr for AccountId20 {
 	type Err = &'static str;
 
 	fn from_str(s: &str) -> Result<Self, Self::Err> {