diff --git a/libavformat/tls_gnutls.c b/libavformat/tls_gnutls.c
index 1d3f57cb35..0fade36ed6 100644
--- a/libavformat/tls_gnutls.c
+++ b/libavformat/tls_gnutls.c
@@ -37,6 +37,7 @@
 
 #if HAVE_THREADS && GNUTLS_VERSION_NUMBER <= 0x020b00
 #include <gcrypt.h>
+#include "libavutil/thread.h"
 GCRY_THREAD_OPTION_PTHREAD_IMPL;
 #endif