diff --git a/libavformat/yuv4mpeg.c b/libavformat/yuv4mpeg.c
index 361ef8eeec..dd623205da 100644
--- a/libavformat/yuv4mpeg.c
+++ b/libavformat/yuv4mpeg.c
@@ -22,13 +22,13 @@
 #define Y4M_FRAME_MAGIC "FRAME"
 #define Y4M_LINE_MAX 256
 
-#ifdef CONFIG_MUXERS
-
 struct frame_attributes {
     int interlaced_frame;
     int top_field_first;
 };
 
+#ifdef CONFIG_MUXERS
+
 static int yuv4_generate_header(AVFormatContext *s, char* buf)
 {
     AVStream *st;