diff --git a/src/enc/vp8l.c b/src/enc/vp8l.c
index c76f132d..bf645fbc 100644
--- a/src/enc/vp8l.c
+++ b/src/enc/vp8l.c
@@ -338,6 +338,8 @@ static int GetHuffBitLengthsAndCodes(
     for (idx = 0; idx <= 5 * i + k; ++idx) {
       free(bit_lengths[idx]);
       free(bit_codes[idx]);
+      bit_lengths[idx] = NULL;
+      bit_codes[idx] = NULL;
     }
   }
   return 0;