diff --git a/libmpdemux/tvi_v4l.c b/libmpdemux/tvi_v4l.c
index 397f63f20f..b3f962b302 100644
--- a/libmpdemux/tvi_v4l.c
+++ b/libmpdemux/tvi_v4l.c
@@ -63,7 +63,7 @@ static tvi_info_t info = {
 
 #define NTSC_WIDTH  640
 #define NTSC_HEIGHT 480
-#define NTSC_FPS    29.97
+#define NTSC_FPS    (30000.0/1001.0)
 
 #define MAX_AUDIO_CHANNELS	10