diff --git a/eth2/utils/ssz_derive/src/lib.rs b/eth2/utils/ssz_derive/src/lib.rs
index bd367e039..59cef746a 100644
--- a/eth2/utils/ssz_derive/src/lib.rs
+++ b/eth2/utils/ssz_derive/src/lib.rs
@@ -231,7 +231,7 @@ pub fn ssz_decode_derive(input: TokenStream) -> TokenStream {
                 }
             }
 
-            fn from_ssz_bytes(bytes: &[u8]) -> Result<Self, ssz::DecodeError> {
+            fn from_ssz_bytes(bytes: &[u8]) -> std::result::Result<Self, ssz::DecodeError> {
                 let mut builder = ssz::SszDecoderBuilder::new(bytes);
 
                 #(
diff --git a/eth2/utils/tree_hash_derive/src/lib.rs b/eth2/utils/tree_hash_derive/src/lib.rs
index bd869dee5..ab61cf08e 100644
--- a/eth2/utils/tree_hash_derive/src/lib.rs
+++ b/eth2/utils/tree_hash_derive/src/lib.rs
@@ -246,7 +246,7 @@ pub fn cached_tree_hash_derive(input: TokenStream) -> TokenStream {
             fn recalculate_tree_hash_root(
                 &self,
                 cache: &mut #cache_type)
-            -> Result<Hash256, cached_tree_hash::Error>
+            -> std::result::Result<Hash256, cached_tree_hash::Error>
             {
                 let mut leaves = vec![];