diff --git a/tools/target_dec_fuzzer.c b/tools/target_dec_fuzzer.c
index 3146bf2c1a..a94d5e6a92 100644
--- a/tools/target_dec_fuzzer.c
+++ b/tools/target_dec_fuzzer.c
@@ -193,6 +193,7 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
         av_free(parser_avctx);
         return 0; // Failure of avcodec_open2() does not imply that a issue was found
     }
+    parser_avctx->codec_id = ctx->codec_id;
 
     FDBCreate(&buffer);
     int got_frame;