diff --git a/martian-derive/src/lib.rs b/martian-derive/src/lib.rs
index 06a9450222..03c1f8260c 100644
--- a/martian-derive/src/lib.rs
+++ b/martian-derive/src/lib.rs
@@ -3,7 +3,6 @@
 /// TODO:
 /// - Handle default values for FileType
 /// - Repo wide reorganization
-extern crate proc_macro;
 use martian::{utils, MartianBlanketType, MartianPrimaryType, StageKind, Volatile, MARTIAN_TOKENS};
 use quote::quote;
 use std::collections::{HashMap, HashSet};
diff --git a/martian/src/stage.rs b/martian/src/stage.rs
index 852b9205ab..81ba68edd3 100644
--- a/martian/src/stage.rs
+++ b/martian/src/stage.rs
@@ -136,7 +136,7 @@ struct GpuResource {
 }
 
 impl std::fmt::Display for GpuResource {
-    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         write!(f, "gpu_count{}_mem{}", self.count, self.mem)
     }
 }