diff --git a/tools/target_dem_fuzzer.c b/tools/target_dem_fuzzer.c
index 79d572a6dc..a4d69bb230 100644
--- a/tools/target_dem_fuzzer.c
+++ b/tools/target_dem_fuzzer.c
@@ -104,14 +104,14 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
     int seekable = 0;
     int ret;
     AVInputFormat *fmt = NULL;
-
-    if (!c) {
 #ifdef FFMPEG_DEMUXER
 #define DEMUXER_SYMBOL0(DEMUXER) ff_##DEMUXER##_demuxer
 #define DEMUXER_SYMBOL(DEMUXER) DEMUXER_SYMBOL0(DEMUXER)
-        extern AVInputFormat DEMUXER_SYMBOL(FFMPEG_DEMUXER);
-        fmt = &DEMUXER_SYMBOL(FFMPEG_DEMUXER);
+    extern AVInputFormat DEMUXER_SYMBOL(FFMPEG_DEMUXER);
+    fmt = &DEMUXER_SYMBOL(FFMPEG_DEMUXER);
 #endif
+
+    if (!c) {
         av_register_all();
         avcodec_register_all();
         av_log_set_level(AV_LOG_PANIC);