diff --git a/libavformat/nutdec.c b/libavformat/nutdec.c
index da438ad127..2013bc83b4 100644
--- a/libavformat/nutdec.c
+++ b/libavformat/nutdec.c
@@ -76,8 +76,8 @@ static uint64_t get_fourcc(AVIOContext *bc)
 }
 
 #ifdef TRACE
-static inline uint64_t get_v_trace(AVIOContext *bc, char *file,
-                                   char *func, int line)
+static inline uint64_t get_v_trace(AVIOContext *bc, const char *file,
+                                   const char *func, int line)
 {
     uint64_t v = ffio_read_varlen(bc);
 
@@ -86,8 +86,8 @@ static inline uint64_t get_v_trace(AVIOContext *bc, char *file,
     return v;
 }
 
-static inline int64_t get_s_trace(AVIOContext *bc, char *file,
-                                  char *func, int line)
+static inline int64_t get_s_trace(AVIOContext *bc, const char *file,
+                                  const char *func, int line)
 {
     int64_t v = get_s(bc);