diff --git a/ui/drivers/cocoa/ui_cocoa_browser_window.m b/ui/drivers/cocoa/ui_cocoa_browser_window.m
index e8597b2b9d..47a096f69b 100644
--- a/ui/drivers/cocoa/ui_cocoa_browser_window.m
+++ b/ui/drivers/cocoa/ui_cocoa_browser_window.m
@@ -19,6 +19,8 @@
 #include <stdlib.h>
 #include <string.h>
 
+#include <string/stdstring.h>
+
 #include "cocoa_common.h"
 
 #include "../../ui_companion_driver.h"
diff --git a/ui/drivers/cocoa/ui_cocoa_window.m b/ui/drivers/cocoa/ui_cocoa_window.m
index 6a2282575f..be3f743cab 100644
--- a/ui/drivers/cocoa/ui_cocoa_window.m
+++ b/ui/drivers/cocoa/ui_cocoa_window.m
@@ -19,6 +19,8 @@
 #include <stdlib.h>
 #include <string.h>
 
+#include <string/stdstring.h>
+
 #include "cocoa_common.h"
 #include "../ui_cocoa.h"
 #include "../../ui_companion_driver.h"