diff --git a/libavutil/intmath.h b/libavutil/intmath.h
index b412385e5318d784bba1ad6aad4713a703b807a8..ec7286a539e94a0b5faa1f6f35180a7f67da1664 100644
--- a/libavutil/intmath.h
+++ b/libavutil/intmath.h
@@ -167,7 +167,7 @@ static av_always_inline av_const int ff_ctz_c( int v )
  * http://supertech.csail.mit.edu/papers/debruijn.pdf. */
 static av_always_inline av_const int ff_ctzll_c(long long v)
 {
-    static const int debruijn_ctz64[64] = {
+    static const uint8_t debruijn_ctz64[64] = {
         0, 1, 2, 53, 3, 7, 54, 27, 4, 38, 41, 8, 34, 55, 48, 28,
         62, 5, 39, 46, 44, 42, 22, 9, 24, 35, 59, 56, 49, 18, 29, 11,
         63, 52, 6, 26, 37, 40, 33, 47, 61, 45, 43, 21, 23, 58, 17, 10,