1 files changed, 2 insertions, 0 deletions
diff --git a/crypto/ex_data.c b/crypto/ex_data.c
index d672b464a6..6200d05529 100644
--- a/crypto/ex_data.c
+++ b/crypto/ex_data.c
@@ -10,6 +10,8 @@
 #include "crypto/cryptlib.h"
 #include "internal/thread_once.h"
 
+DEFINE_STACK_OF(void)
+
 int do_ex_data_init(OPENSSL_CTX *ctx)
 {
     OSSL_EX_DATA_GLOBAL *global = openssl_ctx_get_ex_data_global(ctx);