diff --git a/libswscale/utils.c b/libswscale/utils.c
index 7a969867ed..4458e8f700 100644
--- a/libswscale/utils.c
+++ b/libswscale/utils.c
@@ -18,6 +18,7 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#define _SVID_SOURCE //needed for MAP_ANONYMOUS
 #include <inttypes.h>
 #include <string.h>
 #include <math.h>