diff --git a/openssl-sys/build/cfgs.rs b/openssl-sys/build/cfgs.rs
index f09ec29b53529c03b71d2ad31fc5417ef39f87bb..2f3ff3eafd66af92c1b3e3f1b1c105939b7535aa 100644
--- a/openssl-sys/build/cfgs.rs
+++ b/openssl-sys/build/cfgs.rs
@@ -1,3 +1,4 @@
+#[allow(clippy::unusual_byte_groupings)]
 pub fn get(openssl_version: Option<u64>, libressl_version: Option<u64>) -> Vec<&'static str> {
     let mut cfgs = vec![];
 
diff --git a/openssl-sys/build/main.rs b/openssl-sys/build/main.rs
index 1762068d7567760db3c997e714b0104d62239a8e..306482d1a826a9a70921a42a12b6f9e0cfa2c151 100644
--- a/openssl-sys/build/main.rs
+++ b/openssl-sys/build/main.rs
@@ -1,9 +1,3 @@
-#![allow(
-    clippy::inconsistent_digit_grouping,
-    clippy::uninlined_format_args,
-    clippy::unusual_byte_groupings
-)]
-
 #[cfg(feature = "bindgen")]
 extern crate bindgen;
 extern crate cc;
@@ -131,7 +125,6 @@ fn main() {
     }
 }
 
-#[allow(clippy::let_and_return)]
 fn postprocess(include_dirs: &[PathBuf]) -> Version {
     let version = validate_headers(include_dirs);
 
@@ -146,7 +139,7 @@ fn postprocess(include_dirs: &[PathBuf]) -> Version {
 
 /// Validates the header files found in `include_dir` and then returns the
 /// version string of OpenSSL.
-#[allow(clippy::manual_strip)] // we need to support pre-1.45.0
+#[allow(clippy::unusual_byte_groupings)]
 fn validate_headers(include_dirs: &[PathBuf]) -> Version {
     // This `*-sys` crate only works with OpenSSL 1.0.1, 1.0.2, 1.1.0, 1.1.1 and 3.0.0.
     // To correctly expose the right API from this crate, take a look at
diff --git a/openssl-sys/src/lib.rs b/openssl-sys/src/lib.rs
index 5a65e8b349f43546c65a4f48946ba31f8dc130ae..784b7637e1368abe2745eff2b3c4fc52951ae213 100644
--- a/openssl-sys/src/lib.rs
+++ b/openssl-sys/src/lib.rs
@@ -1,13 +1,9 @@
 #![allow(
     clippy::missing_safety_doc,
-    clippy::unreadable_literal,
-    clippy::uninlined_format_args,
-    clippy::upper_case_acronyms,
     dead_code,
     non_camel_case_types,
     non_snake_case,
     non_upper_case_globals,
-    overflowing_literals,
     unused_imports
 )]
 #![cfg_attr(feature = "unstable_boringssl", allow(ambiguous_glob_reexports))]