diff --git a/openssl-sys/src/handwritten/x509.rs b/openssl-sys/src/handwritten/x509.rs
index c5419ed6eb..a93142cd2a 100644
--- a/openssl-sys/src/handwritten/x509.rs
+++ b/openssl-sys/src/handwritten/x509.rs
@@ -702,6 +702,7 @@ pub struct X509_PURPOSE {
 const_ptr_api! {
     extern "C" {
         pub fn X509_PURPOSE_get_by_sname(sname: #[const_ptr_if(any(ossl110, libressl280))] c_char) -> c_int;
+        pub fn X509_PURPOSE_get_id(purpose: #[const_ptr_if(any(ossl110, libressl280))] X509_PURPOSE) -> c_int;
     }
 }
 extern "C" {
diff --git a/openssl/src/x509/mod.rs b/openssl/src/x509/mod.rs
index 197afb0bbb..8458e7313d 100644
--- a/openssl/src/x509/mod.rs
+++ b/openssl/src/x509/mod.rs
@@ -2538,7 +2538,7 @@ impl X509PurposeRef {
         unsafe {
             let sname = CString::new(sname).unwrap();
             cfg_if! {
-                if #[cfg(any(ossl110, libressl280))] {
+                if #[cfg(any(ossl110, libressl280, boringssl))] {
                     let purpose = cvt_n(ffi::X509_PURPOSE_get_by_sname(sname.as_ptr() as *const _))?;
                 } else {
                     let purpose = cvt_n(ffi::X509_PURPOSE_get_by_sname(sname.as_ptr() as *mut _))?;
@@ -2569,8 +2569,14 @@ impl X509PurposeRef {
     /// - `X509_PURPOSE_TIMESTAMP_SIGN`
     pub fn purpose(&self) -> X509PurposeId {
         unsafe {
-            let x509_purpose: *mut ffi::X509_PURPOSE = self.as_ptr();
-            X509PurposeId::from_raw((*x509_purpose).purpose)
+            cfg_if! {
+                if #[cfg(any(ossl110, libressl280, boringssl))] {
+                    let x509_purpose = self.as_ptr() as *const ffi::X509_PURPOSE;
+                } else {
+                    let x509_purpose = self.as_ptr() as *mut ffi::X509_PURPOSE;
+                }
+            }
+            X509PurposeId::from_raw(ffi::X509_PURPOSE_get_id(x509_purpose))
         }
     }
 }