diff --git a/array_test.go b/array_test.go
index 450b392..0a09f42 100644
--- a/array_test.go
+++ b/array_test.go
@@ -331,8 +331,12 @@ func TestArray_isArray(t *testing.T) {
 
 	test := runTest()
 	test(`
-        [ Array.isArray(), Array.isArray([]), Array.isArray({}) ];
-    `, "false,true,false")
+       [ Array.isArray.length, Array.isArray(), Array.isArray([]), Array.isArray({}) ];
+    `, "1,false,true,false")
+
+	test(`
+        [ Array.isArray(Math) ];
+    `, "false")
 }
 
 func TestArray_indexOf(t *testing.T) {
diff --git a/inline b/inline
index 7c8df37..eaaa555 100755
--- a/inline
+++ b/inline
@@ -264,7 +264,7 @@ sub newContext {
                 1,
                 $self->functionDeclare(
                     $class,
-                    "isArray", 0,
+                    "isArray", 1,
                 ),
             ),
         }),
diff --git a/inline.go b/inline.go
index 4e4adbe..77ba15f 100644
--- a/inline.go
+++ b/inline.go
@@ -1302,7 +1302,7 @@ func _newContext(runtime *_runtime) {
 					mode: 0,
 					value: Value{
 						_valueType: valueNumber,
-						value:      0,
+						value:      1,
 					},
 				},
 			},