diff --git a/src/syscall/js/js.go b/src/syscall/js/js.go
index e095eaa12b..12ea5e743d 100644
--- a/src/syscall/js/js.go
+++ b/src/syscall/js/js.go
@@ -361,9 +361,9 @@ func (v Value) Bool() bool {
 	}
 }
 
-// Truthy returns the JavaScript "truthiness" of the value v.  In JavaScript,
+// Truthy returns the JavaScript "truthiness" of the value v. In JavaScript,
 // false, 0, "", null, undefined, and NaN are "falsy", and everything else is
-// "truthy".  See https://developer.mozilla.org/en-US/docs/Glossary/Truthy.
+// "truthy". See https://developer.mozilla.org/en-US/docs/Glossary/Truthy.
 func (v Value) Truthy() bool {
 	switch v.Type() {
 	case TypeUndefined, TypeNull:
@@ -371,10 +371,7 @@ func (v Value) Truthy() bool {
 	case TypeBoolean:
 		return v.Bool()
 	case TypeNumber:
-		if v.ref == valueNaN.ref {
-			return false
-		}
-		return v.ref != valueZero.ref
+		return v.ref != valueNaN.ref && v.ref != valueZero.ref
 	case TypeString:
 		return v.String() != ""
 	case TypeSymbol, TypeFunction, TypeObject: