diff --git a/crates/oxc_codegen/src/gen.rs b/crates/oxc_codegen/src/gen.rs
index 26d2a278de32..9672ad0769a8 100644
--- a/crates/oxc_codegen/src/gen.rs
+++ b/crates/oxc_codegen/src/gen.rs
@@ -3073,6 +3073,9 @@ impl<'a, const MINIFY: bool> Gen<MINIFY> for TSSignature<'a> {
                 }
             }
             Self::TSCallSignatureDeclaration(signature) => {
+                if let Some(type_parameters) = signature.type_parameters.as_ref() {
+                    type_parameters.gen(p, ctx);
+                }
                 p.print_str(b"(");
                 if let Some(this_param) = &signature.this_param {
                     this_param.gen(p, ctx);
diff --git a/crates/oxc_codegen/tests/mod.rs b/crates/oxc_codegen/tests/mod.rs
index ba8742becf6e..c6df2b62c59c 100644
--- a/crates/oxc_codegen/tests/mod.rs
+++ b/crates/oxc_codegen/tests/mod.rs
@@ -199,6 +199,7 @@ fn typescript() {
         "class A {\n\treadonly type = 'frame';\n}\n",
         false,
     );
+    test_ts("let foo: { <T>(t: T): void }", "let foo: {<T>(t: T): void};\n", false);
 }
 
 fn test_comment_helper(source_text: &str, expected: &str) {