diff --git a/libavutil/slicethread.c b/libavutil/slicethread.c
index 6593d58abc..7650fc66ad 100644
--- a/libavutil/slicethread.c
+++ b/libavutil/slicethread.c
@@ -95,6 +95,7 @@ static void *attribute_align_arg thread_worker(void *v)
     }
 }
 
+av_cold
 int avpriv_slicethread_create(AVSliceThread **pctx, void *priv,
                               void (*worker_func)(void *priv, int jobnr, int threadnr, int nb_jobs, int nb_threads),
                               void (*main_func)(void *priv),
@@ -222,7 +223,7 @@ void avpriv_slicethread_execute(AVSliceThread *ctx, int nb_jobs, int execute_mai
     }
 }
 
-void avpriv_slicethread_free(AVSliceThread **pctx)
+av_cold void avpriv_slicethread_free(AVSliceThread **pctx)
 {
     AVSliceThread *ctx = *pctx;
     int nb_workers, i;