diff --git a/validator/val_secalgo.c b/validator/val_secalgo.c
index 7f5c518..bd7e89f 100644
--- a/validator/val_secalgo.c
+++ b/validator/val_secalgo.c
@@ -72,6 +72,14 @@
 #include <openssl/engine.h>
 #endif
 
+#ifdef HAVE_OPENSSL_DSA_H
+#include <openssl/dsa.h>
+#endif
+
+#ifdef HAVE_OPENSSL_BN_H
+#include <openssl/bn.h>
+#endif
+
 /** fake DSA support for unit tests */
 int fake_dsa = 0;
 /** fake SHA1 support for unit tests */