diff --git a/es2panda/parser/parserImpl.cpp b/es2panda/parser/parserImpl.cpp
index 212fc8f3e337de54604804fabdb1ea34d2ac1bdf..4c44ee5f1e41ff53a13f63a25a90dd076249f04a 100644
--- a/es2panda/parser/parserImpl.cpp
+++ b/es2panda/parser/parserImpl.cpp
@@ -2650,9 +2650,7 @@ bool ParserImpl::IsMethodDefinitionsAreSame(const ir::MethodDefinition *property
 ir::Identifier *ParserImpl::SetIdentNodeInClassDefinition()
 {
     lexer::TokenType keywType = lexer_->GetToken().KeywordType();
-    if (keywType >= lexer::TokenType::KEYW_STATIC) {
-        ThrowSyntaxError("Unexpected reserved word");
-    }
+    CheckStrictReservedWord();
 
     if (keywType == lexer::TokenType::KEYW_AWAIT && context_.IsModule()) {
         ThrowSyntaxError("Unexpected reserved word");
diff --git a/es2panda/test/parser/js/class-declaration-is-expected.txt b/es2panda/test/parser/js/class-declaration-is-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..f83f21df9659b91bd6d62e9d29563c21a74435fe
--- /dev/null
+++ b/es2panda/test/parser/js/class-declaration-is-expected.txt
@@ -0,0 +1,139 @@
+{
+  "type": "Program",
+  "statements": [
+    {
+      "type": "ClassDeclaration",
+      "definition": {
+        "id": {
+          "type": "Identifier",
+          "name": "is",
+          "decorators": [],
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 7
+            },
+            "end": {
+              "line": 1,
+              "column": 9
+            }
+          }
+        },
+        "superClass": null,
+        "implements": [],
+        "constructor": {
+          "type": "MethodDefinition",
+          "key": {
+            "type": "Identifier",
+            "name": "constructor",
+            "decorators": [],
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 1
+              },
+              "end": {
+                "line": 1,
+                "column": 1
+              }
+            }
+          },
+          "kind": "constructor",
+          "static": false,
+          "optional": false,
+          "computed": false,
+          "value": {
+            "type": "FunctionExpression",
+            "function": {
+              "type": "ScriptFunction",
+              "id": null,
+              "generator": false,
+              "async": false,
+              "expression": false,
+              "params": [],
+              "body": {
+                "type": "BlockStatement",
+                "statements": [],
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 1
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 1
+                  }
+                }
+              },
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 1
+                },
+                "end": {
+                  "line": 1,
+                  "column": 1
+                }
+              }
+            },
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 1
+              },
+              "end": {
+                "line": 1,
+                "column": 1
+              }
+            }
+          },
+          "overloads": [],
+          "decorators": [],
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 1
+            },
+            "end": {
+              "line": 1,
+              "column": 12
+            }
+          }
+        },
+        "body": [],
+        "indexSignatures": [],
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 10
+          },
+          "end": {
+            "line": 1,
+            "column": 12
+          }
+        }
+      },
+      "decorators": [],
+      "loc": {
+        "start": {
+          "line": 1,
+          "column": 1
+        },
+        "end": {
+          "line": 1,
+          "column": 12
+        }
+      }
+    }
+  ],
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 1
+    },
+    "end": {
+      "line": 1,
+      "column": 12
+    }
+  }
+}
diff --git a/es2panda/test/parser/js/class-declaration-is.js b/es2panda/test/parser/js/class-declaration-is.js
new file mode 100644
index 0000000000000000000000000000000000000000..2e8c0c369ba03373569e869ea1ac63f4e754eb45
--- /dev/null
+++ b/es2panda/test/parser/js/class-declaration-is.js
@@ -0,0 +1 @@
+class is {}
\ No newline at end of file