diff --git a/src/option_parser.cpp b/src/option_parser.cpp
index 9450c153..a3630862 100644
--- a/src/option_parser.cpp
+++ b/src/option_parser.cpp
@@ -143,12 +143,6 @@ _parse_and_process_kv_arg(OptData           *optdata_,
     key = "cache.entry";
   ef(key == "negative_entry")
     key = "cache.negative_entry";
-  ef(key == "direct_io" && val.empty())
-    val = "true";
-  ef(key == "kernel_cache" && val.empty())
-    val = "true";
-  ef(key == "auto_cache" && val.empty())
-    val = "true";
   ef(key == "async_read" && val.empty())
     val = "true";
   ef(key == "sync_read" && val.empty())