diff --git a/test_conformance/printf/test_printf.cpp b/test_conformance/printf/test_printf.cpp
index 424b42d3f..3d539ed57 100644
--- a/test_conformance/printf/test_printf.cpp
+++ b/test_conformance/printf/test_printf.cpp
@@ -21,6 +21,7 @@
 #include <algorithm>
 #include <array>
 #include <cstdarg>
+#include <cstdint>
 #include <errno.h>
 #include <memory>
 #include <string.h>