diff --git a/configure b/configure
index 71590ad3f0..017eed4a9e 100755
--- a/configure
+++ b/configure
@@ -7925,6 +7925,9 @@ $_def_muxers
 #define CONFIG_GPL 1
 #define ENABLE_SMALL 0
 
+/* Support for grayscale encoding/decoding in FFmpeg (makes color slower) */
+#define ENABLE_GRAY 1
+
 /* Use AMR codecs from libavcodec. */
 $_def_libamr
 $_def_libamr_nb