diff --git a/libavformat/tls_openssl.c b/libavformat/tls_openssl.c
index 3df6e3f0a1..c1db49d334 100644
--- a/libavformat/tls_openssl.c
+++ b/libavformat/tls_openssl.c
@@ -20,6 +20,7 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#include "libavutil/avassert.h"
 #include "libavutil/mem.h"
 #include "network.h"
 #include "os_support.h"
@@ -818,6 +819,7 @@ static int dtls_start(URLContext *h, const char *url, int flags, AVDictionary **
     TLSContext *c = h->priv_data;
     TLSShared *s = &c->tls_shared;
     int ret = 0;
+    av_assert0(s);
     s->is_dtls = 1;
 
     /**
@@ -918,6 +920,7 @@ static int tls_open(URLContext *h, const char *uri, int flags, AVDictionary **op
     TLSShared *s = &c->tls_shared;
     int ret;
 
+    av_assert0(s);
     if ((ret = ff_tls_open_underlying(s, h, uri, options)) < 0)
         goto fail;