diff --git a/openssl/src/dh/mod.rs b/openssl/src/dh/mod.rs
index 14bf076d9b05d5336d87feb962dc90aafc526459..bf1ca73e858e9b6578187f83f7ee08e16574f673 100644
--- a/openssl/src/dh/mod.rs
+++ b/openssl/src/dh/mod.rs
@@ -81,7 +81,7 @@ mod tests {
     #[test]
     #[cfg(feature = "rfc5114")]
     fn test_dh_rfc5114() {
-        let ctx = SslContext::new(Sslv23).unwrap();
+        let mut ctx = SslContext::new(Sslv23).unwrap();
         let dh1 = DH::get_1024_160().unwrap();
         ctx.set_tmp_dh(dh1).unwrap();
         let dh2 = DH::get_2048_224().unwrap();
@@ -92,7 +92,7 @@ mod tests {
 
     #[test]
     fn test_dh() {
-        let ctx = SslContext::new(Sslv23).unwrap();
+        let mut ctx = SslContext::new(Sslv23).unwrap();
         let p = BigNum::from_hex_str("87A8E61DB4B6663CFFBBD19C651959998CEEF608660DD0F25D2CEED4435\
                                       E3B00E00DF8F1D61957D4FAF7DF4561B2AA3016C3D91134096FAA3BF429\
                                       6D830E9A7C209E0C6497517ABD5A8A9D306BCF67ED91F9E6725B4758C02\
@@ -122,7 +122,7 @@ mod tests {
 
     #[test]
     fn test_dh_from_pem() {
-        let ctx = SslContext::new(Sslv23).unwrap();
+        let mut ctx = SslContext::new(Sslv23).unwrap();
         let pem_path = Path::new("test/dhparams.pem");
         let mut file = File::open(&pem_path)
                            .ok()
diff --git a/openssl/src/ssl/mod.rs b/openssl/src/ssl/mod.rs
index 5536a99e7546be1d61cc3883ac4ce0fc253e97a9..89a7f7d49a322eff8b78c8f237fcdaee4101a42b 100644
--- a/openssl/src/ssl/mod.rs
+++ b/openssl/src/ssl/mod.rs
@@ -521,13 +521,13 @@ impl SslContext {
         }
     }
 
-    pub fn set_read_ahead(&self, m: u32) {
+    pub fn set_read_ahead(&mut self, m: u32) {
         unsafe {
             ffi_extras::SSL_CTX_set_read_ahead(self.ctx, m as c_long);
         }
     }
 
-    pub fn set_tmp_dh(&self, dh: DH) -> Result<(), ErrorStack> {
+    pub fn set_tmp_dh(&mut self, dh: DH) -> Result<(), ErrorStack> {
         wrap_ssl_result(unsafe { ffi_extras::SSL_CTX_set_tmp_dh(self.ctx, dh.raw()) as i32 })
     }
 
@@ -647,7 +647,7 @@ impl SslContext {
         SslContextOptions::from_bits(ret).unwrap()
     }
 
-    pub fn options(&mut self) -> SslContextOptions {
+    pub fn options(&self) -> SslContextOptions {
         let ret = unsafe { ffi_extras::SSL_CTX_get_options(self.ctx) };
         SslContextOptions::from_bits(ret).unwrap()
     }
diff --git a/openssl/src/ssl/tests/mod.rs b/openssl/src/ssl/tests/mod.rs
index cc376cf40199e6864e9eb93a8dcabb634d114225..94bb4b4be7b0bb28a16b92f28fd579346cef79ab 100644
--- a/openssl/src/ssl/tests/mod.rs
+++ b/openssl/src/ssl/tests/mod.rs
@@ -437,7 +437,7 @@ fn test_set_certificate_and_private_key() {
 }
 
 run_test!(get_ctx_options, |method, _| {
-    let mut ctx = SslContext::new(method).unwrap();
+    let ctx = SslContext::new(method).unwrap();
     ctx.options();
 });