diff --git a/io.c b/io.c
index f2d1f84be8..1aa5a0e72a 100644
--- a/io.c
+++ b/io.c
@@ -10783,6 +10783,8 @@ nogvl_copy_file_range(struct copy_stream_struct *stp)
 	}
         switch (errno) {
 	  case EINVAL:
+	  case EPERM: /* copy_file_range(2) doesn't exist (may happen in
+			 docker container) */
 #ifdef ENOSYS
 	  case ENOSYS:
 #endif