diff --git a/src/snmalloc/mem/backend_concept.h b/src/snmalloc/mem/backend_concept.h
index d5f74a8e0..b58834134 100644
--- a/src/snmalloc/mem/backend_concept.h
+++ b/src/snmalloc/mem/backend_concept.h
@@ -4,7 +4,7 @@
 #  include "../ds/ds.h"
 #  include "sizeclasstable.h"
 
-#  include <cstddef>
+#  include <stddef.h>
 
 namespace snmalloc
 {
diff --git a/src/snmalloc/pal/pal_concept.h b/src/snmalloc/pal/pal_concept.h
index deab9cb9b..9005556e6 100644
--- a/src/snmalloc/pal/pal_concept.h
+++ b/src/snmalloc/pal/pal_concept.h
@@ -4,8 +4,6 @@
 #  include "pal_consts.h"
 #  include "pal_ds.h"
 
-#  include <utility>
-
 namespace snmalloc
 {
   /*