diff --git a/crates/oxc_isolated_declarations/src/lib.rs b/crates/oxc_isolated_declarations/src/lib.rs
index 28b2f25f1034b..c6ce198479cda 100644
--- a/crates/oxc_isolated_declarations/src/lib.rs
+++ b/crates/oxc_isolated_declarations/src/lib.rs
@@ -314,9 +314,6 @@ impl<'a> IsolatedDeclarations<'a> {
                         new_ast_stmts.push(Statement::ImportDeclaration(decl));
                     }
                 }
-                Statement::TSModuleDeclaration(decl) => {
-                    new_ast_stmts.push(Statement::TSModuleDeclaration(decl));
-                }
                 _ => {}
             }
         }
diff --git a/crates/oxc_isolated_declarations/tests/fixtures/module-declaration.ts b/crates/oxc_isolated_declarations/tests/fixtures/module-declaration.ts
deleted file mode 100644
index ce062696a1910..0000000000000
--- a/crates/oxc_isolated_declarations/tests/fixtures/module-declaration.ts
+++ /dev/null
@@ -1,5 +0,0 @@
-import 'foo';
-declare module 'foo' {
-    interface Foo {}
-    const foo = 42;
-}
\ No newline at end of file
diff --git a/crates/oxc_isolated_declarations/tests/snapshots/module-declaration.snap b/crates/oxc_isolated_declarations/tests/snapshots/module-declaration.snap
deleted file mode 100644
index 05c4731dfdb18..0000000000000
--- a/crates/oxc_isolated_declarations/tests/snapshots/module-declaration.snap
+++ /dev/null
@@ -1,12 +0,0 @@
----
-source: crates/oxc_isolated_declarations/tests/mod.rs
-input_file: crates/oxc_isolated_declarations/tests/fixtures/module-declaration.ts
----
-==================== .D.TS ====================
-
-import "foo";
-declare module "foo" {
-	interface Foo {}
-	const foo = 42;
-}
-export {};