diff --git a/phf/src/lib.rs b/phf/src/lib.rs
index 4f7545d6..627d3e81 100644
--- a/phf/src/lib.rs
+++ b/phf/src/lib.rs
@@ -97,14 +97,14 @@ extern crate std as core;
 ///     assert_eq!(MY_MAP["hello"], 1);
 /// }
 /// ```
-#[::proc_macro_hack::proc_macro_hack]
+#[proc_macro_hack::proc_macro_hack]
 pub use phf_macros::phf_map;
 
 #[cfg(feature = "macros")]
 /// Macro to create a `static` (compile-time) [`OrderedMap`].
 ///
 /// Requires the `macros` feature. Same usage as [`phf_map`].
-#[::proc_macro_hack::proc_macro_hack]
+#[proc_macro_hack::proc_macro_hack]
 pub use phf_macros::phf_ordered_map;
 
 #[cfg(feature = "macros")]
diff --git a/phf_macros/src/lib.rs b/phf_macros/src/lib.rs
index ca68cc51..8161b05f 100644
--- a/phf_macros/src/lib.rs
+++ b/phf_macros/src/lib.rs
@@ -3,9 +3,6 @@
 //!
 //! [phf]: https://docs.rs/phf
 
-// FIXME: Remove `extern crate` below when we bump MSRV to 1.42 or higher.
-extern crate proc_macro;
-
 use phf_generator::HashState;
 use phf_shared::PhfHash;
 use proc_macro::TokenStream;
@@ -288,7 +285,7 @@ fn build_ordered_map(entries: &[Entry], state: HashState) -> proc_macro2::TokenS
     }
 }
 
-#[::proc_macro_hack::proc_macro_hack]
+#[proc_macro_hack::proc_macro_hack]
 pub fn phf_map(input: TokenStream) -> TokenStream {
     let map = parse_macro_input!(input as Map);
     let state = phf_generator::generate_hash(&map.0);
@@ -296,7 +293,7 @@ pub fn phf_map(input: TokenStream) -> TokenStream {
     build_map(&map.0, state).into()
 }
 
-#[::proc_macro_hack::proc_macro_hack]
+#[proc_macro_hack::proc_macro_hack]
 pub fn phf_set(input: TokenStream) -> TokenStream {
     let set = parse_macro_input!(input as Set);
     let state = phf_generator::generate_hash(&set.0);
@@ -305,7 +302,7 @@ pub fn phf_set(input: TokenStream) -> TokenStream {
     quote!(phf::Set { map: #map }).into()
 }
 
-#[::proc_macro_hack::proc_macro_hack]
+#[proc_macro_hack::proc_macro_hack]
 pub fn phf_ordered_map(input: TokenStream) -> TokenStream {
     let map = parse_macro_input!(input as Map);
     let state = phf_generator::generate_hash(&map.0);
@@ -313,7 +310,7 @@ pub fn phf_ordered_map(input: TokenStream) -> TokenStream {
     build_ordered_map(&map.0, state).into()
 }
 
-#[::proc_macro_hack::proc_macro_hack]
+#[proc_macro_hack::proc_macro_hack]
 pub fn phf_ordered_set(input: TokenStream) -> TokenStream {
     let set = parse_macro_input!(input as Set);
     let state = phf_generator::generate_hash(&set.0);