diff --git a/regress/misc/sk-dummy/sk-dummy.c b/regress/misc/sk-dummy/sk-dummy.c
index 579d6098e..50003495b 100644
--- a/regress/misc/sk-dummy/sk-dummy.c
+++ b/regress/misc/sk-dummy/sk-dummy.c
@@ -38,6 +38,7 @@
 #ifdef WITH_OPENSSL
 /* We don't use sha2 from OpenSSL and they can conflict with system sha2.h */
 #define OPENSSL_NO_SHA
+#define USE_LIBC_SHA2	/* NetBSD 9 */
 #include <openssl/opensslv.h>
 #include <openssl/crypto.h>
 #include <openssl/evp.h>