diff --git a/double-conversion/strtod.cc b/double-conversion/strtod.cc
index 850bcda..24fd859 100644
--- a/double-conversion/strtod.cc
+++ b/double-conversion/strtod.cc
@@ -460,6 +460,11 @@
   return ('1' <= d) && (d <= '9');
 }
 
+#ifdef __has_cpp_attribute
+#if __has_cpp_attribute(maybe_unused)
+[[maybe_unused]]
+#endif
+#endif
 static bool AssertTrimmedDigits(const Vector<const char>& buffer) {
   for(int i = 0; i < buffer.length(); ++i) {
     if(!IsDigit(buffer[i])) {