diff --git a/crates/oxc_codegen/src/gen.rs b/crates/oxc_codegen/src/gen.rs
index 46d9adb580ecf..3b80d465203a1 100644
--- a/crates/oxc_codegen/src/gen.rs
+++ b/crates/oxc_codegen/src/gen.rs
@@ -3267,9 +3267,12 @@ impl<'a, const MINIFY: bool> Gen<MINIFY> for TSModuleDeclaration<'a> {
         if self.declare {
             p.print_str(b"declare ");
         }
-        p.print_str(b"module");
-        p.print_space_before_identifier();
-        self.id.gen(p, ctx);
+        self.kind.gen(p, ctx);
+        // If the kind is global, then the id is also `global`, so we don't need to print it
+        if !self.kind.is_global() {
+            p.print_space_before_identifier();
+            self.id.gen(p, ctx);
+        }
 
         if let Some(body) = &self.body {
             let mut body = body;
@@ -3296,6 +3299,22 @@ impl<'a, const MINIFY: bool> Gen<MINIFY> for TSModuleDeclaration<'a> {
     }
 }
 
+impl<const MINIFY: bool> Gen<MINIFY> for TSModuleDeclarationKind {
+    fn gen(&self, p: &mut Codegen<{ MINIFY }>, _: Context) {
+        match self {
+            TSModuleDeclarationKind::Global => {
+                p.print_str(b"global");
+            }
+            TSModuleDeclarationKind::Module => {
+                p.print_str(b"module");
+            }
+            TSModuleDeclarationKind::Namespace => {
+                p.print_str(b"namespace");
+            }
+        }
+    }
+}
+
 impl<'a, const MINIFY: bool> Gen<MINIFY> for TSModuleDeclarationName<'a> {
     fn gen(&self, p: &mut Codegen<{ MINIFY }>, ctx: Context) {
         match self {
diff --git a/crates/oxc_isolated_declarations/tests/snapshots/declare-global.snap b/crates/oxc_isolated_declarations/tests/snapshots/declare-global.snap
index 3b9bfaca72c1c..51bbc0340e3e8 100644
--- a/crates/oxc_isolated_declarations/tests/snapshots/declare-global.snap
+++ b/crates/oxc_isolated_declarations/tests/snapshots/declare-global.snap
@@ -4,5 +4,5 @@ input_file: crates/oxc_isolated_declarations/tests/fixtures/declare-global.ts
 ---
 ==================== .D.TS ====================
 
-declare module global {}
+declare global {}
 export {};
diff --git a/crates/oxc_isolated_declarations/tests/snapshots/expando-function.snap b/crates/oxc_isolated_declarations/tests/snapshots/expando-function.snap
index 9f41e74cc5f6c..f62c6293d980c 100644
--- a/crates/oxc_isolated_declarations/tests/snapshots/expando-function.snap
+++ b/crates/oxc_isolated_declarations/tests/snapshots/expando-function.snap
@@ -6,7 +6,7 @@ input_file: crates/oxc_isolated_declarations/tests/fixtures/expando-function.ts
 
 export declare function foo(): void;
 export declare const bar: () => void;
-export declare module NS {
+export declare namespace NS {
 	export const goo: () => void;
 }
 
diff --git a/tasks/coverage/transpile.snap b/tasks/coverage/transpile.snap
index 9a23c816bf854..c9735e00fc17b 100644
--- a/tasks/coverage/transpile.snap
+++ b/tasks/coverage/transpile.snap
@@ -9,7 +9,7 @@ Mismatch: "declarationRestParameters.ts"
 
 #### "declarationComputedPropertyNames.ts" ####
 //// [declarationComputedPropertyNames.ts] ////
-export module presentNs {
+export namespace presentNs {
 	export const a = Symbol();
 }
 const aliasing = Symbol;
@@ -67,7 +67,7 @@ export const D = {
 };
 
 //// [declarationComputedPropertyNames.d.ts] ////
-export declare module presentNs {
+export declare namespace presentNs {
 	export const a: unknown;
 }
 declare const aliasing: unknown;