diff --git a/global.go b/global.go
index f8fcb1f..0c1782f 100644
--- a/global.go
+++ b/global.go
@@ -701,7 +701,7 @@ func newContext() *_runtime {
 		"undefined", UndefinedValue(),
 		"NaN", NaNValue(),
 		"Infinity", positiveInfinityValue(),
-		"eval", builtinGlobal_eval,
+		"eval", 1, builtinGlobal_eval,
 		"parseInt", builtinGlobal_parseInt,
 		"parseFloat", builtinGlobal_parseFloat,
 		"isNaN", builtinGlobal_isNaN,
diff --git a/global_test.go b/global_test.go
index f02b115..a6dfcb7 100644
--- a/global_test.go
+++ b/global_test.go
@@ -43,6 +43,8 @@ func TestGlobal(t *testing.T) {
 	test(`new Number().constructor == Number`, "true")
 
 	test(`this.hasOwnProperty`, "[function]")
+
+	test(`eval.length === 1`, "true")
 }
 
 func TestGlobalLength(t *testing.T) {