diff --git a/lib/hcrypto/evp.h b/lib/hcrypto/evp.h
index 33cb6a071..e1d93dcd9 100644
--- a/lib/hcrypto/evp.h
+++ b/lib/hcrypto/evp.h
@@ -161,6 +161,10 @@ struct hc_EVP_MD_CTX {
     void *ptr;
 };
 
+#ifdef  __cplusplus
+extern "C" {
+#endif
+
 /*
  * Avaible crypto algs
  */
@@ -258,4 +262,8 @@ void	OpenSSL_add_all_algorithms(void);
 void	OpenSSL_add_all_algorithms_conf(void);
 void	OpenSSL_add_all_algorithms_noconf(void);
 
+#ifdef  __cplusplus
+}
+#endif
+
 #endif /* HEIM_EVP_H */