diff --git a/src/lib/yajl/Callbacks.hxx b/src/lib/yajl/Callbacks.hxx
index 73039ebc9..f2bc9ffe3 100644
--- a/src/lib/yajl/Callbacks.hxx
+++ b/src/lib/yajl/Callbacks.hxx
@@ -1,14 +1,13 @@
 // SPDX-License-Identifier: BSD-2-Clause
 // author: Max Kellermann <max.kellermann@gmail.com>
 
-#ifndef YAJL_CALLBACKS_HXX
-#define YAJL_CALLBACKS_HXX
+#pragma once
 
 #include "util/Cast.hxx"
 
 #include <string_view>
 
-#include <yajl/yajl_parse.h>
+#include <yajl_parse.h>
 
 namespace Yajl {
 
@@ -59,5 +58,3 @@ struct CallbacksWrapper {
 };
 
 } // namespace Yajl
-
-#endif
diff --git a/src/lib/yajl/Gen.hxx b/src/lib/yajl/Gen.hxx
index f19b0e806..84efdbcce 100644
--- a/src/lib/yajl/Gen.hxx
+++ b/src/lib/yajl/Gen.hxx
@@ -1,10 +1,9 @@
 // SPDX-License-Identifier: BSD-2-Clause
 // author: Max Kellermann <max.kellermann@gmail.com>
 
-#ifndef YAJL_GEN_HXX
-#define YAJL_GEN_HXX
+#pragma once
 
-#include <yajl/yajl_gen.h>
+#include <yajl_gen.h>
 
 #include <algorithm>
 #include <span>
@@ -74,5 +73,3 @@ public:
 };
 
 } // namespace Yajl
-
-#endif
diff --git a/src/lib/yajl/Handle.hxx b/src/lib/yajl/Handle.hxx
index 6ef0eb8fe..28e4fe942 100644
--- a/src/lib/yajl/Handle.hxx
+++ b/src/lib/yajl/Handle.hxx
@@ -1,10 +1,9 @@
 // SPDX-License-Identifier: BSD-2-Clause
 // author: Max Kellermann <max.kellermann@gmail.com>
 
-#ifndef YAJL_HANDLE_HXX
-#define YAJL_HANDLE_HXX
+#pragma once
 
-#include <yajl/yajl_parse.h>
+#include <yajl_parse.h>
 
 #include <utility>
 
@@ -56,5 +55,3 @@ private:
 };
 
 } // namespace Yajl
-
-#endif