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-rw-r--r--libavformat/fitsenc.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/libavformat/fitsenc.c b/libavformat/fitsenc.c
index 0dcdcdfb04..7cb171596c 100644
--- a/libavformat/fitsenc.c
+++ b/libavformat/fitsenc.c
@@ -58,7 +58,7 @@ static int write_keyword_value(AVFormatContext *s, const char *keyword, int valu
header[9] = ' ';
ret = snprintf(header + 10, 70, "%d", value);
- header[ret + 10] = ' ';
+ memset(&header[ret + 10], ' ', sizeof(header) - (ret + 10));
avio_write(s->pb, header, sizeof(header));
*lines_written += 1;