diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
index b1aa7e266b..22d56760ec 100644
--- a/libavcodec/allcodecs.c
+++ b/libavcodec/allcodecs.c
@@ -882,10 +882,11 @@ const AVCodec *av_codec_iterate(void **opaque)
 
     ff_thread_once(&av_codec_static_init, av_codec_init_static);
 
-    if (c)
+    if (c) {
         *opaque = (void*)(i + 1);
-
-    return &c->p;
+        return &c->p;
+    }
+    return NULL;
 }
 
 static enum AVCodecID remap_deprecated_codec_id(enum AVCodecID id)