diff --git a/Cargo.toml b/Cargo.toml
index bd41f01..809a3e0 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -31,3 +31,6 @@ mmio = []
 nightly = []
 pci = ["dep:pci_types"]
 zerocopy = ["dep:zerocopy", "dep:zerocopy-derive", "endian-num/zerocopy"]
+
+[lints.rust]
+rust_2018_idioms = "warn"
diff --git a/src/bitflags.rs b/src/bitflags.rs
index 8505a98..48ed674 100644
--- a/src/bitflags.rs
+++ b/src/bitflags.rs
@@ -84,7 +84,7 @@ macro_rules! virtio_bitflags {
 macro_rules! impl_fmt {
     ($Trait:ident for $SelfT:ty) => {
         impl ::core::fmt::$Trait for $SelfT {
-            fn fmt(&self, f: &mut ::core::fmt::Formatter) -> ::core::fmt::Result {
+            fn fmt(&self, f: &mut ::core::fmt::Formatter<'_>) -> ::core::fmt::Result {
                 self.0.fmt(f)
             }
         }