diff --git a/libavformat/grab.c b/libavformat/grab.c
index 1abfbd60a4..3db37482fd 100644
--- a/libavformat/grab.c
+++ b/libavformat/grab.c
@@ -19,6 +19,7 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include "avformat.h"
+#include "dsputil.h"
 #include <unistd.h>
 #include <fcntl.h>
 #include <sys/ioctl.h>