diff --git a/libavutil/slicethread.c b/libavutil/slicethread.c
index f928a5cf00..867ce32238 100644
--- a/libavutil/slicethread.c
+++ b/libavutil/slicethread.c
@@ -240,7 +240,7 @@ int avpriv_slicethread_create(AVSliceThread **pctx, void *priv,
                               int nb_threads)
 {
     *pctx = NULL;
-    return AVERROR(EINVAL);
+    return AVERROR(ENOSYS);
 }
 
 void avpriv_slicethread_execute(AVSliceThread *ctx, int nb_jobs, int execute_main)