diff --git a/ci-constraints-requirements.txt b/ci-constraints-requirements.txt
index d7cada634a2b..0835ba5d5fe0 100644
--- a/ci-constraints-requirements.txt
+++ b/ci-constraints-requirements.txt
@@ -32,7 +32,7 @@ check-sdist==1.2.0 ; python_full_version >= '3.8'
     # via cryptography (pyproject.toml)
 click==8.1.7
     # via cryptography (pyproject.toml)
-colorama==0.4.6 ; (platform_system != 'Windows' and sys_platform == 'win32') or platform_system == 'Windows' or os_name == 'nt'
+colorama==0.4.6 ; os_name == 'nt' or (platform_system == 'Windows' and sys_platform != 'win32') or sys_platform == 'win32'
     # via
     #   build
     #   click
diff --git a/src/rust/src/x509/csr.rs b/src/rust/src/x509/csr.rs
index ae669d941bf5..89051d824c0e 100644
--- a/src/rust/src/x509/csr.rs
+++ b/src/rust/src/x509/csr.rs
@@ -221,17 +221,14 @@ impl CertificateSigningRequest {
     }
 
     #[getter]
-    fn is_signature_valid(
-        slf: pyo3::PyRef<'_, Self>,
-        py: pyo3::Python<'_>,
-    ) -> CryptographyResult<bool> {
-        let public_key = slf.public_key(py)?;
+    fn is_signature_valid(&self, py: pyo3::Python<'_>) -> CryptographyResult<bool> {
+        let public_key = self.public_key(py)?;
         Ok(sign::verify_signature_with_signature_algorithm(
             py,
             public_key,
-            &slf.raw.borrow_dependent().signature_alg,
-            slf.raw.borrow_dependent().signature.as_bytes(),
-            &asn1::write_single(&slf.raw.borrow_dependent().csr_info)?,
+            &self.raw.borrow_dependent().signature_alg,
+            self.raw.borrow_dependent().signature.as_bytes(),
+            &asn1::write_single(&self.raw.borrow_dependent().csr_info)?,
         )
         .is_ok())
     }