diff --git a/README.md b/README.md
index 3893221..a761c0c 100755
--- a/README.md
+++ b/README.md
@@ -113,7 +113,7 @@ EXPORT_STAR_LIB: `Object.keys(` IDENTIFIER$1 `).forEach(function (` IDENTIFIER$2
         (`if (` IDENTIFIER$2 `in` EXPORTS_IDENTIFIER `&&` EXPORTS_IDENTIFIER `[` IDENTIFIER$2 `] ===` IDENTIFIER$1 `[` IDENTIFIER$2 `]) return` `;`)?
       )?
     ) |
-    `if (` IDENTIFIER$2 `!==` ( `'default'` | `"default"` ) (`&& !` (`Object` `.prototype`? `.hasOwnProperty.call(`  IDENTIFIER$1 `, ` IDENTIFIER$2 `)` | IDENTIFIER$1 `.hasOwnProperty(` IDENTIFIER$2 `)`))? `)`
+    `if (` IDENTIFIER$2 `!==` ( `'default'` | `"default"` ) (`&& !` (`Object` `.prototype`? `.hasOwnProperty.call(`  IDENTIFIER `, ` IDENTIFIER$2 `)` | IDENTIFIER `.hasOwnProperty(` IDENTIFIER$2 `)`))? `)`
   )
   (
     EXPORTS_IDENTIFIER `[` IDENTIFIER$2 `] =` IDENTIFIER$1 `[` IDENTIFIER$2 `]` `;`? |
diff --git a/lexer.js b/lexer.js
index b66e372..1bf3123 100755
--- a/lexer.js
+++ b/lexer.js
@@ -651,8 +651,10 @@ function tryParseObjectDefineOrKeys (keys) {
             if (ch !== 33/*!*/) break;
             pos += 1;
             ch = commentWhitespace();
-            if (source.startsWith(id, pos)) {
-              pos += id.length;
+            if (ch === 79/*O*/ && source.startsWith('bject', pos + 1) && source[pos + 6] === '.') {
+              if (!tryParseObjectHasOwnProperty(it_id)) break;
+            }
+            else if (identifier()) {
               ch = commentWhitespace();
               if (ch !== 46/*.*/) break;
               pos++;
@@ -669,7 +671,7 @@ function tryParseObjectDefineOrKeys (keys) {
               if (ch !== 41/*)*/) break;
               pos += 1;
             }
-            else if (!tryParseObjectHasOwnProperty(it_id)) break;
+            else break;
             ch = commentWhitespace();
           }
           if (ch !== 41/*)*/) break;
diff --git a/lib/lexer.wasm b/lib/lexer.wasm
index 4244f7e..2591e76 100755
Binary files a/lib/lexer.wasm and b/lib/lexer.wasm differ
diff --git a/lib/lexer.wat b/lib/lexer.wat
index 666c857..03a0b43 100644
--- a/lib/lexer.wat
+++ b/lib/lexer.wat
@@ -2879,107 +2879,113 @@
               i32.const 2
               i32.add
               i32.store offset=20540
-              call 39
-              drop
               block  ;; label = @6
                 block  ;; label = @7
-                  i32.const 0
-                  i32.load offset=20540
-                  local.tee 0
-                  local.get 2
-                  local.get 6
-                  call 65
-                  br_if 0 (;@7;)
-                  i32.const 0
-                  local.get 0
-                  local.get 7
-                  i32.const 1
-                  i32.shl
-                  i32.add
-                  i32.store offset=20540
                   call 39
-                  i32.const 46
-                  i32.ne
-                  br_if 6 (;@1;)
-                  i32.const 0
-                  i32.const 0
-                  i32.load offset=20540
-                  i32.const 2
-                  i32.add
-                  i32.store offset=20540
-                  call 39
-                  i32.const 104
+                  local.tee 0
+                  i32.const 79
                   i32.ne
-                  br_if 6 (;@1;)
+                  br_if 0 (;@7;)
                   i32.const 0
                   i32.load offset=20540
-                  local.tee 0
                   i32.const 2
                   i32.add
-                  i32.const 97
-                  i32.const 115
-                  i32.const 79
-                  i32.const 119
-                  i32.const 110
-                  i32.const 80
-                  i32.const 114
-                  i32.const 111
-                  i32.const 112
+                  i32.const 98
+                  i32.const 106
                   i32.const 101
-                  i32.const 114
+                  i32.const 99
                   i32.const 116
-                  i32.const 121
-                  call 47
+                  i32.const 46
+                  call 38
                   i32.eqz
-                  br_if 6 (;@1;)
-                  i32.const 0
-                  local.get 0
-                  i32.const 28
-                  i32.add
-                  i32.store offset=20540
-                  call 39
-                  i32.const 40
-                  i32.ne
-                  br_if 6 (;@1;)
-                  i32.const 0
-                  i32.const 0
-                  i32.load offset=20540
-                  i32.const 2
-                  i32.add
-                  i32.store offset=20540
-                  call 39
-                  drop
-                  i32.const 0
-                  i32.load offset=20540
-                  local.tee 0
+                  br_if 0 (;@7;)
                   local.get 4
-                  local.get 3
-                  call 65
-                  br_if 6 (;@1;)
-                  i32.const 0
-                  local.get 0
                   local.get 8
-                  i32.const 1
-                  i32.shl
-                  i32.add
-                  i32.store offset=20540
-                  call 39
-                  i32.const 41
-                  i32.ne
+                  call 51
+                  i32.eqz
                   br_if 6 (;@1;)
-                  i32.const 0
-                  i32.const 0
-                  i32.load offset=20540
-                  i32.const 2
-                  i32.add
-                  i32.store offset=20540
                   br 1 (;@6;)
                 end
+                local.get 0
+                call 45
+                i32.eqz
+                br_if 0 (;@6;)
+                call 39
+                i32.const 46
+                i32.ne
+                br_if 5 (;@1;)
+                i32.const 0
+                i32.const 0
+                i32.load offset=20540
+                i32.const 2
+                i32.add
+                i32.store offset=20540
+                call 39
+                i32.const 104
+                i32.ne
+                br_if 5 (;@1;)
+                i32.const 0
+                i32.load offset=20540
+                local.tee 0
+                i32.const 2
+                i32.add
+                i32.const 97
+                i32.const 115
+                i32.const 79
+                i32.const 119
+                i32.const 110
+                i32.const 80
+                i32.const 114
+                i32.const 111
+                i32.const 112
+                i32.const 101
+                i32.const 114
+                i32.const 116
+                i32.const 121
+                call 47
+                i32.eqz
+                br_if 5 (;@1;)
+                i32.const 0
+                local.get 0
+                i32.const 28
+                i32.add
+                i32.store offset=20540
+                call 39
+                i32.const 40
+                i32.ne
+                br_if 5 (;@1;)
+                i32.const 0
+                i32.const 0
+                i32.load offset=20540
+                i32.const 2
+                i32.add
+                i32.store offset=20540
+                call 39
+                drop
+                i32.const 0
+                i32.load offset=20540
+                local.tee 0
                 local.get 4
+                local.get 3
+                call 65
+                br_if 5 (;@1;)
+                i32.const 0
+                local.get 0
                 local.get 8
-                call 51
-                i32.eqz
+                i32.const 1
+                i32.shl
+                i32.add
+                i32.store offset=20540
+                call 39
+                i32.const 41
+                i32.ne
                 br_if 5 (;@1;)
+                i32.const 0
+                i32.const 0
+                i32.load offset=20540
+                i32.const 2
+                i32.add
+                i32.store offset=20540
               end
               call 39
               local.set 0
diff --git a/src/lexer.c b/src/lexer.c
index e86f4b5..ce12a98 100755
--- a/src/lexer.c
+++ b/src/lexer.c
@@ -641,8 +641,10 @@ void tryParseObjectDefineOrKeys (bool keys) {
             if (ch != '!') break;
             pos += 1;
             ch = commentWhitespace();
-            if (memcmp(pos, id_start, id_len * sizeof(uint16_t)) == 0) {
-              pos += id_len;
+            if (ch == 'O' && str_eq6(pos + 1, 'b', 'j', 'e', 'c', 't', '.')) {
+              if (!tryParseObjectHasOwnProperty(it_id_start, it_id_len)) break;
+            }
+            else if (identifier(ch)) {
               ch = commentWhitespace();
               if (ch != '.') break;
               pos++;
@@ -659,7 +661,6 @@ void tryParseObjectDefineOrKeys (bool keys) {
               if (ch != ')') break;
               pos += 1;
             }
-            else if (!tryParseObjectHasOwnProperty(it_id_start, it_id_len)) break;
             ch = commentWhitespace();
           }
           if (ch != ')') break;
diff --git a/test/_unit.js b/test/_unit.js
index e1d01b6..2c215df 100755
--- a/test/_unit.js
+++ b/test/_unit.js
@@ -228,8 +228,13 @@ suite('Lexer', () => {
         if (k !== 'default' && !Object.hasOwnProperty.call(exports, k)) exports[k] = external5[k];
       });
 
+      const not = require('not');
+      Object.keys(not).forEach(function (k) {
+        if (k !== 'default' && !a().hasOwnProperty(k)) exports[k] = not[k];
+      });
+
       Object.keys(external6).forEach(function (k) {
-        if (k !== 'default' && !external6.hasOwnProperty(k)) exports[k] = external6[k];
+        if (k !== 'default' && !exports.hasOwnProperty(k)) exports[k] = external6[k];
       });
 
       const external𤭢 = require('external𤭢');