diff --git a/libavformat/allformats.c b/libavformat/allformats.c
index 1779477200..40a8be376c 100644
--- a/libavformat/allformats.c
+++ b/libavformat/allformats.c
@@ -22,15 +22,18 @@
 #include "rtp_internal.h"
 #include "rdt.h"
 
-#define REGISTER_MUXER(X,x) { extern AVOutputFormat x##_muxer; \
+#define REGISTER_MUXER(X,x) {
+    extern AVOutputFormat x##_muxer; \
     if(ENABLE_##X##_MUXER) av_register_output_format(&x##_muxer); }
 
-#define REGISTER_DEMUXER(X,x) { extern AVInputFormat x##_demuxer; \
+#define REGISTER_DEMUXER(X,x) {
+    extern AVInputFormat x##_demuxer; \
     if(ENABLE_##X##_DEMUXER) av_register_input_format(&x##_demuxer); }
 
 #define REGISTER_MUXDEMUX(X,x)  REGISTER_MUXER(X,x); REGISTER_DEMUXER(X,x)
 
-#define REGISTER_PROTOCOL(X,x) { extern URLProtocol x##_protocol; \
+#define REGISTER_PROTOCOL(X,x) {
+    extern URLProtocol x##_protocol; \
     if(ENABLE_##X##_PROTOCOL) register_protocol(&x##_protocol); }
 
 /* If you do not call this function, then you can select exactly which