diff --git a/libcxx/test/std/depr/depr.c.headers/wchar_h.pass.cpp b/libcxx/test/std/depr/depr.c.headers/wchar_h.pass.cpp
--- a/libcxx/test/std/depr/depr.c.headers/wchar_h.pass.cpp
+++ b/libcxx/test/std/depr/depr.c.headers/wchar_h.pass.cpp
@@ -10,6 +10,7 @@
 
 #include <wchar.h>
 #include <stdarg.h>
+#include <stdio.h>
 #include <type_traits>
 
 #include "test_macros.h"
diff --git a/libcxx/test/std/strings/c.strings/cwchar.pass.cpp b/libcxx/test/std/strings/c.strings/cwchar.pass.cpp
--- a/libcxx/test/std/strings/c.strings/cwchar.pass.cpp
+++ b/libcxx/test/std/strings/c.strings/cwchar.pass.cpp
@@ -11,6 +11,7 @@
 #include <cwchar>
 #include <ctime>
 #include <cstdarg>
+#include <cstdio>
 #include <type_traits>
 
 #include "test_macros.h"