diff --git a/lib/isc/openssl_shim.c b/lib/isc/openssl_shim.c
index 8a2e20b15b..bdcb9693a6 100644
--- a/lib/isc/openssl_shim.c
+++ b/lib/isc/openssl_shim.c
@@ -16,6 +16,7 @@
 #include <string.h>
 
 #include <openssl/crypto.h>
+#include <openssl/err.h>
 #include <openssl/evp.h>
 #include <openssl/opensslv.h>
 #include <openssl/ssl.h>
diff --git a/lib/isc/tls.c b/lib/isc/tls.c
index d564998af5..2107d02087 100644
--- a/lib/isc/tls.c
+++ b/lib/isc/tls.c
@@ -25,6 +25,9 @@
 #include <openssl/conf.h>
 #include <openssl/crypto.h>
 #include <openssl/dh.h>
+#if !defined(OPENSSL_NO_ENGINE) && OPENSSL_API_LEVEL < 30000
+#include <openssl/engine.h>
+#endif /* if !defined(OPENSSL_NO_ENGINE) && OPENSSL_API_LEVEL < 30000 */
 #include <openssl/err.h>
 #include <openssl/evp.h>
 #include <openssl/opensslv.h>