diff --git a/crates/oxc_codegen/src/gen.rs b/crates/oxc_codegen/src/gen.rs
index d28ee441b3..de73c6fef1 100644
--- a/crates/oxc_codegen/src/gen.rs
+++ b/crates/oxc_codegen/src/gen.rs
@@ -2780,6 +2780,9 @@ impl Gen for PropertyDefinition<'_> {
         if self.optional {
             p.print_ascii_byte(b'?');
         }
+        if self.definite {
+            p.print_ascii_byte(b'!');
+        }
         if let Some(type_annotation) = &self.type_annotation {
             p.print_colon();
             p.print_soft_space();
diff --git a/crates/oxc_codegen/tests/integration/ts.rs b/crates/oxc_codegen/tests/integration/ts.rs
index 9dfd7243ec..d2370bf983 100644
--- a/crates/oxc_codegen/tests/integration/ts.rs
+++ b/crates/oxc_codegen/tests/integration/ts.rs
@@ -31,6 +31,7 @@ fn cases() {
     test_same("class B {\n\tconstructor(override readonly a: number) {}\n}\n");
     test_same("class C extends B {\n\toverride show(): void;\n\toverride hide(): void;\n}\n");
     test_same("class D extends B {\n\toverride readonly x: number;\n}\n");
+    test_same("class E {\n\tsubscribe!: string;\n}\n");
     test_same("export { type as as };\n");
 }