diff --git a/libavformat/hlsenc.c b/libavformat/hlsenc.c
index 32b8ab9694..4f74b5f04b 100644
--- a/libavformat/hlsenc.c
+++ b/libavformat/hlsenc.c
@@ -38,7 +38,7 @@ typedef struct ListEntry {
 
 typedef struct HLSContext {
     const AVClass *class;  // Class for private options.
-    int number;
+    unsigned number;
     int64_t sequence;
     AVOutputFormat *oformat;
     AVFormatContext *avf;