diff --git a/libavformat/allformats.c b/libavformat/allformats.c
index 20f48c04e8..781e4c488a 100644
--- a/libavformat/allformats.c
+++ b/libavformat/allformats.c
@@ -45,8 +45,7 @@
     {                                                                   \
         extern URLProtocol ff_##x##_protocol;                           \
         if (CONFIG_##X##_PROTOCOL)                                      \
-            ffurl_register_protocol(&ff_##x##_protocol,                 \
-                                    sizeof(ff_##x##_protocol));         \
+            ffurl_register_protocol(&ff_##x##_protocol);                \
     }
 
 void av_register_all(void)
diff --git a/libavformat/avio.c b/libavformat/avio.c
index b297ce89c6..225d9821a0 100644
--- a/libavformat/avio.c
+++ b/libavformat/avio.c
@@ -94,14 +94,9 @@ const char *avio_enum_protocols(void **opaque, int output)
     return avio_enum_protocols(opaque, output);
 }
 
-int ffurl_register_protocol(URLProtocol *protocol, int size)
+int ffurl_register_protocol(URLProtocol *protocol)
 {
     URLProtocol **p;
-    if (size < sizeof(URLProtocol)) {
-        URLProtocol *temp = av_mallocz(sizeof(URLProtocol));
-        memcpy(temp, protocol, size);
-        protocol = temp;
-    }
     p = &first_protocol;
     while (*p != NULL)
         p = &(*p)->next;
diff --git a/libavformat/url.h b/libavformat/url.h
index 686fe29410..712ea0f5b4 100644
--- a/libavformat/url.h
+++ b/libavformat/url.h
@@ -226,10 +226,8 @@ int ffurl_shutdown(URLContext *h, int flags);
 
 /**
  * Register the URLProtocol protocol.
- *
- * @param size the size of the URLProtocol struct referenced
  */
-int ffurl_register_protocol(URLProtocol *protocol, int size);
+int ffurl_register_protocol(URLProtocol *protocol);
 
 /**
  * Check if the user has requested to interrup a blocking function