diff --git a/avconv_opt.c b/avconv_opt.c
index 03544545c9..0ea2f45d7e 100644
--- a/avconv_opt.c
+++ b/avconv_opt.c
@@ -351,6 +351,8 @@ static int copy_metadata(char *outspec, char *inspec, AVFormatContext *oc, AVFor
             METADATA_CHECK_INDEX(index, context->nb_programs, "program")\
             meta = &context->programs[index]->metadata;\
             break;\
+        case 's':\
+            break; /* handled separately below */ \
         default: av_assert0(0);\
         }\