diff --git a/openssl-sys-extras/src/lib.rs b/openssl-sys-extras/src/lib.rs
index c602c514..bd3598eb 100644
--- a/openssl-sys-extras/src/lib.rs
+++ b/openssl-sys-extras/src/lib.rs
@@ -38,6 +38,9 @@ extern {
     #[cfg_attr(not(target_os = "nacl"), link_name = "HMAC_Update_shim")]
     pub fn HMAC_Update(ctx: *mut HMAC_CTX, input: *const u8, len: c_uint) -> c_int;
 
+    // This isn't defined in < 1.0 so we copy the implementation there
+    pub fn HMAC_CTX_copy(dst: *mut HMAC_CTX, src: *const HMAC_CTX) -> c_int;
+
     // These functions are defined in OpenSSL as macros, so we shim them
     #[link_name = "BIO_eof_shim"]
     pub fn BIO_eof(b: *mut BIO) -> c_int;
diff --git a/openssl-sys/src/lib.rs b/openssl-sys/src/lib.rs
index e0964d84..674b303f 100644
--- a/openssl-sys/src/lib.rs
+++ b/openssl-sys/src/lib.rs
@@ -454,7 +454,6 @@ extern "C" {
 
     pub fn HMAC_CTX_init(ctx: *mut HMAC_CTX);
     pub fn HMAC_CTX_cleanup(ctx: *mut HMAC_CTX);
-    pub fn HMAC_CTX_copy(dst: *mut HMAC_CTX, src: *const HMAC_CTX) -> c_int;
 
     pub fn PEM_read_bio_DHparams(bio: *mut BIO, out: *mut *mut DH, callback: Option<PasswordCallback>,
                              user_data: *mut c_void) -> *mut DH;
diff --git a/openssl/src/crypto/hmac.rs b/openssl/src/crypto/hmac.rs
index 474cbc8a..2c329c1b 100644
--- a/openssl/src/crypto/hmac.rs
+++ b/openssl/src/crypto/hmac.rs
@@ -170,7 +170,7 @@ impl Clone for HMAC {
         let mut ctx: ffi::HMAC_CTX;
         unsafe {
             ctx = ::std::mem::uninitialized();
-            let r = ffi::HMAC_CTX_copy(&mut ctx, &self.ctx);
+            let r = ffi_extras::HMAC_CTX_copy(&mut ctx, &self.ctx);
             assert_eq!(r, 1);
         }
         HMAC { ctx: ctx, type_: self.type_, state: self.state }