diff --git a/libavformat/rm.c b/libavformat/rm.c
index 9911aac91e..29a6e408e0 100644
--- a/libavformat/rm.c
+++ b/libavformat/rm.c
@@ -21,7 +21,7 @@
 
 #include "rm.h"
 
-const char *ff_rm_metadata[4] = {
+const char * const ff_rm_metadata[4] = {
     "title",
     "author",
     "copyright",
diff --git a/libavformat/rm.h b/libavformat/rm.h
index a60004883a..68207e1fe1 100644
--- a/libavformat/rm.h
+++ b/libavformat/rm.h
@@ -24,7 +24,7 @@
 
 #include "avformat.h"
 
-extern const char *ff_rm_metadata[4];
+extern const char * const ff_rm_metadata[4];
 
 typedef struct RMStream RMStream;