diff --git a/openssl-sys/src/lib.rs b/openssl-sys/src/lib.rs
index 070ed6c6..3d7c59c3 100644
--- a/openssl-sys/src/lib.rs
+++ b/openssl-sys/src/lib.rs
@@ -823,6 +823,7 @@ extern "C" {
     pub fn X509_STORE_CTX_get_current_cert(ct: *mut X509_STORE_CTX) -> *mut X509;
     pub fn X509_STORE_CTX_get_error(ctx: *mut X509_STORE_CTX) -> c_int;
     pub fn X509_STORE_CTX_get_ex_data(ctx: *mut X509_STORE_CTX, idx: c_int) -> *mut c_void;
+    pub fn X509_STORE_CTX_get_error_depth(ctx: *mut X509_STORE_CTX) -> c_int;
 
     pub fn X509V3_EXT_conf_nid(conf: *mut c_void, ctx: *mut X509V3_CTX, ext_nid: c_int, value: *mut c_char) -> *mut X509_EXTENSION;
     pub fn X509V3_EXT_conf(conf: *mut c_void, ctx: *mut X509V3_CTX, name: *mut c_char, value: *mut c_char) -> *mut X509_EXTENSION;
diff --git a/openssl/src/x509/mod.rs b/openssl/src/x509/mod.rs
index cdd729aa..af1e6ed1 100644
--- a/openssl/src/x509/mod.rs
+++ b/openssl/src/x509/mod.rs
@@ -104,6 +104,10 @@ impl X509StoreContext {
             })
         }
     }
+
+    pub fn error_depth(&self) -> u32 {
+        unsafe { ffi::X509_STORE_CTX_get_error_depth(self.ctx) as u32 }
+    }
 }
 
 #[allow(non_snake_case)]