diff --git a/js/public/RequiredDefines.h b/js/public/RequiredDefines.h
index f9db8ea5b89f..3ab8fd189e51 100644
--- a/js/public/RequiredDefines.h
+++ b/js/public/RequiredDefines.h
@@ -28,7 +28,4 @@
 #define __STDC_CONSTANT_MACROS
 #define __STDC_FORMAT_MACROS
 
-/* Also define a char16_t type if not provided by the compiler. */
-#include "mozilla/Char16.h"
-
 #endif /* js_RequiredDefines_h */