diff --git a/libavcodec/mss3.c b/libavcodec/mss3.c
index 075685b902..3b97320c6a 100644
--- a/libavcodec/mss3.c
+++ b/libavcodec/mss3.c
@@ -356,8 +356,9 @@ static int rac_get_model2_sym(RangeCoder *c, Model2 *m)
 
 static int rac_get_model_sym(RangeCoder *c, Model *m)
 {
-    int prob, prob2, helper, val;
+    int val;
     int end, end2;
+    unsigned prob, prob2, helper;
 
     prob       = 0;
     prob2      = c->range;