diff --git a/substrate/primitives/finality-grandpa/Cargo.toml b/substrate/primitives/finality-grandpa/Cargo.toml
index dfa6b572d8..6498763e4c 100644
--- a/substrate/primitives/finality-grandpa/Cargo.toml
+++ b/substrate/primitives/finality-grandpa/Cargo.toml
@@ -23,3 +23,6 @@ std = [
 	"sp-api/std",
 	"sp-runtime/std",
 ]
+full_crypto = [
+	"app-crypto/full_crypto"
+]
diff --git a/substrate/primitives/finality-grandpa/src/lib.rs b/substrate/primitives/finality-grandpa/src/lib.rs
index f1481c0aed..98fce45081 100644
--- a/substrate/primitives/finality-grandpa/src/lib.rs
+++ b/substrate/primitives/finality-grandpa/src/lib.rs
@@ -34,7 +34,7 @@ mod app {
 }
 
 /// The grandpa crypto scheme defined via the keypair type.
-#[cfg(feature = "std")]
+#[cfg(any(feature = "std", feature = "full_crypto"))]
 pub type AuthorityPair = app::Pair;
 
 /// Identity of a Grandpa authority.