diff --git a/lldb/test/API/functionalities/data-formatter/data-formatter-stl/libcxx-simulators/unique_ptr/main.cpp b/lldb/test/API/functionalities/data-formatter/data-formatter-stl/libcxx-simulators/unique_ptr/main.cpp
index 08324e24f9cc4..a6bfaa3febebb 100644
--- a/lldb/test/API/functionalities/data-formatter/data-formatter-stl/libcxx-simulators/unique_ptr/main.cpp
+++ b/lldb/test/API/functionalities/data-formatter/data-formatter-stl/libcxx-simulators/unique_ptr/main.cpp
@@ -1,5 +1,7 @@
 #include <libcxx-simulators-common/compressed_pair.h>
 
+#include <stdio.h>
+
 namespace std {
 namespace __lldb {
 template <class _Tp> struct default_delete {