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-rw-r--r--include/axolotl/crypto.hh5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/axolotl/crypto.hh b/include/axolotl/crypto.hh
index 42e4b61..7564e8f 100644
--- a/include/axolotl/crypto.hh
+++ b/include/axolotl/crypto.hh
@@ -12,6 +12,9 @@
* See the License for the specific language governing permissions and
* limitations under the License.
*/
+#ifndef AXOLOTL_CRYPTO_HH_
+#define AXOLOTL_CRYPTO_HH_
+
#include <cstdint>
#include <cstddef>
@@ -141,3 +144,5 @@ void hkdf_sha256(
);
} // namespace axolotl
+
+#endif /* AXOLOTL_CRYPTO_HH_ */