5 files changed, 5 insertions, 5 deletions
diff --git a/src/lib/stream/chacha/chacha.h b/src/lib/stream/chacha/chacha.h
index df6e1c9c0..92f8ef035 100644
--- a/src/lib/stream/chacha/chacha.h
+++ b/src/lib/stream/chacha/chacha.h
@@ -15,7 +15,7 @@ namespace Botan {
 /**
 * DJB's ChaCha (http://cr.yp.to/chacha.html)
 */
-class BOTAN_DLL ChaCha : public StreamCipher
+class BOTAN_DLL ChaCha final : public StreamCipher
    {
    public:
       void cipher(const byte in[], byte out[], size_t length) override;
diff --git a/src/lib/stream/ctr/ctr.h b/src/lib/stream/ctr/ctr.h
index f59f06d5f..dc05fa596 100644
--- a/src/lib/stream/ctr/ctr.h
+++ b/src/lib/stream/ctr/ctr.h
@@ -16,7 +16,7 @@ namespace Botan {
 /**
 * CTR-BE (Counter mode, big-endian)
 */
-class BOTAN_DLL CTR_BE : public StreamCipher
+class BOTAN_DLL CTR_BE final : public StreamCipher
    {
    public:
       void cipher(const byte in[], byte out[], size_t length) override;
diff --git a/src/lib/stream/ofb/ofb.h b/src/lib/stream/ofb/ofb.h
index 32dc199bc..4775c5575 100644
--- a/src/lib/stream/ofb/ofb.h
+++ b/src/lib/stream/ofb/ofb.h
@@ -16,7 +16,7 @@ namespace Botan {
 /**
 * Output Feedback Mode
 */
-class BOTAN_DLL OFB : public StreamCipher
+class BOTAN_DLL OFB final : public StreamCipher
    {
    public:
       void cipher(const byte in[], byte out[], size_t length) override;
diff --git a/src/lib/stream/rc4/rc4.h b/src/lib/stream/rc4/rc4.h
index c8c81d1a2..db1726a18 100644
--- a/src/lib/stream/rc4/rc4.h
+++ b/src/lib/stream/rc4/rc4.h
@@ -16,7 +16,7 @@ namespace Botan {
 /**
 * RC4 stream cipher
 */
-class BOTAN_DLL RC4 : public StreamCipher
+class BOTAN_DLL RC4 final : public StreamCipher
    {
    public:
       void cipher(const byte in[], byte out[], size_t length) override;
diff --git a/src/lib/stream/salsa20/salsa20.h b/src/lib/stream/salsa20/salsa20.h
index a5e7a1f14..7e75470da 100644
--- a/src/lib/stream/salsa20/salsa20.h
+++ b/src/lib/stream/salsa20/salsa20.h
@@ -15,7 +15,7 @@ namespace Botan {
 /**
 * DJB's Salsa20 (and XSalsa20)
 */
-class BOTAN_DLL Salsa20 : public StreamCipher
+class BOTAN_DLL Salsa20 final : public StreamCipher
    {
    public:
       void cipher(const byte in[], byte out[], size_t length) override;