diff --git a/include/ossl_random.hpp b/include/ossl_random.hpp
index b392410..0e28944 100644
--- a/include/ossl_random.hpp
+++ b/include/ossl_random.hpp
@@ -2,7 +2,10 @@
 
 #include "logging.hpp"
 
+extern "C"
+{
 #include <openssl/rand.h>
+}
 
 #include <iostream>
 #include <limits>