diff --git a/libavcodec/pictordec.c b/libavcodec/pictordec.c
index a09ee379c023746a4711532a4d1b4cd6137e1094..2dbc040b5ca1173524441d722275d9f5a9940bff 100644
--- a/libavcodec/pictordec.c
+++ b/libavcodec/pictordec.c
@@ -57,7 +57,7 @@ static void picmemset_8bpp(PicContext *s, AVFrame *frame, int value, int run,
     }
 }
 
-static void picmemset(PicContext *s, AVFrame *frame, int value, int run,
+static void picmemset(PicContext *s, AVFrame *frame, unsigned value, int run,
                       int *x, int *y, int *plane, int bits_per_plane)
 {
     uint8_t *d;