diff --git a/libavfilter/vf_palettegen.c b/libavfilter/vf_palettegen.c
index 1f1e90f4b9..323fa53688 100644
--- a/libavfilter/vf_palettegen.c
+++ b/libavfilter/vf_palettegen.c
@@ -52,7 +52,7 @@ enum {
     NB_STATS_MODE
 };
 
-#define NBITS 4
+#define NBITS 5
 #define HIST_SIZE (1<<(3*NBITS))
 
 typedef struct {