diff --git a/mfbt/Attributes.h b/mfbt/Attributes.h
index a948a97d9646..2f50601b0306 100644
--- a/mfbt/Attributes.h
+++ b/mfbt/Attributes.h
@@ -501,6 +501,21 @@
 #  define MOZ_LIFETIME_BOUND /* nothing */
 #endif
 
+/**
+ * MOZ_LIFETIME_CAPTURE_BY(x) indicates that objects that are referred to
+ * by that parameter may also be referred to by x.
+ * See: https://clang.llvm.org/docs/AttributeReference.html#lifetime-capture-by
+ */
+#if defined(__clang__) && defined(__has_cpp_attribute)
+#  if __has_cpp_attribute(clang::lifetime_capture_by)
+#    define MOZ_LIFETIME_CAPTURE_BY(x) [[clang::lifetime_capture_by(x)]]
+#  else
+#    define MOZ_LIFETIME_CAPTURE_BY(x) /* nothing */
+#  endif
+#else
+#  define MOZ_LIFETIME_CAPTURE_BY(x) /* nothing */
+#endif
+
 #ifdef __cplusplus
 
 /**
diff --git a/xpcom/string/nsTDependentString.h b/xpcom/string/nsTDependentString.h
index 0c0efd432a05..acb4ecf41686 100644
--- a/xpcom/string/nsTDependentString.h
+++ b/xpcom/string/nsTDependentString.h
@@ -110,12 +110,12 @@ class MOZ_GSL_POINTER nsTDependentString : public nsTString<T> {
    */
 
   using nsTString<T>::Rebind;
-  void Rebind(const char_type* aData MOZ_LIFETIME_BOUND) {
+  void Rebind(const char_type* aData MOZ_LIFETIME_CAPTURE_BY(this)) {
     Rebind(aData, char_traits::length(aData));
   }
 
-  void Rebind(const char_type* aStart MOZ_LIFETIME_BOUND,
-              const char_type* aEnd MOZ_LIFETIME_BOUND);
+  void Rebind(const char_type* aStart MOZ_LIFETIME_CAPTURE_BY(this),
+              const char_type* aEnd MOZ_LIFETIME_CAPTURE_BY(this));
   void Rebind(const string_type&, index_type aStartPos);
 
  private: