diff --git a/src/executor/stack/mod.rs b/src/executor/stack/mod.rs
index 6cca96dca..fddb737eb 100644
--- a/src/executor/stack/mod.rs
+++ b/src/executor/stack/mod.rs
@@ -12,6 +12,7 @@ pub use self::executor::{
 };
 pub use self::memory::{MemoryStackAccount, MemoryStackState, MemoryStackSubstate};
 pub use self::precompile::{
-	PrecompileFailure, PrecompileFn, PrecompileHandle, PrecompileOutput, PrecompileSet,
+	IsPrecompileResult, PrecompileFailure, PrecompileFn, PrecompileHandle, PrecompileOutput,
+	PrecompileSet,
 };
 pub use ethereum::Log;
diff --git a/src/executor/stack/precompile.rs b/src/executor/stack/precompile.rs
index 25fbee35a..bca915f12 100644
--- a/src/executor/stack/precompile.rs
+++ b/src/executor/stack/precompile.rs
@@ -1,5 +1,5 @@
 use crate::{Context, ExitError, ExitFatal, ExitReason, ExitRevert, ExitSucceed, Transfer};
-use alloc::collections::BTreeMap;
+use alloc::{collections::BTreeMap, vec::Vec};
 use primitive_types::{H160, H256};
 
 /// A precompile result.