diff --git a/rtc_base/strings/string_builder.cc b/rtc_base/strings/string_builder.cc
index adf4fa9e81..73d763a92b 100644
--- a/rtc_base/strings/string_builder.cc
+++ b/rtc_base/strings/string_builder.cc
@@ -11,6 +11,7 @@
 #include "rtc_base/strings/string_builder.h"
 
 #include <stdarg.h>
+#include <cstdio>
 #include <cstring>
 
 #include "rtc_base/checks.h"