--- a/services/webnn/public/cpp/ml_number.cc
+++ b/services/webnn/public/cpp/ml_number.cc
@@ -33,7 +33,7 @@
 
 // static
 MLNumber MLNumber::FromFloat64(double number) {
-  return isnan(number) ? MLNumber(0.0) : MLNumber(number);
+  return std::isnan(number) ? MLNumber(0.0) : MLNumber(number);
 }
 
 // static