diff --git a/libc/test/src/__support/str_to_float_comparison_test.cpp b/libc/test/src/__support/str_to_float_comparison_test.cpp
--- a/libc/test/src/__support/str_to_float_comparison_test.cpp
+++ b/libc/test/src/__support/str_to_float_comparison_test.cpp
@@ -12,6 +12,7 @@
 
 // #include "src/__support/FPUtil/FPBits.h"
 
+#include <cstdint>
 #include <fstream>
 #include <iostream>
 #include <string>