diff --git a/src/bun.js/module_loader.zig b/src/bun.js/module_loader.zig
index e0cc50662a..1681d068ca 100644
--- a/src/bun.js/module_loader.zig
+++ b/src/bun.js/module_loader.zig
@@ -2521,7 +2521,7 @@ pub const ModuleLoader = struct {
                     if (!is_allowed_to_use_internal_testing_apis)
                         return null;
                 }
-                return jsSyntheticModule(.InternalForTesting, specifier);
+                return jsSyntheticModule(.@"bun:internal-for-testing", specifier);
             },
             .@"bun:wrap" => .{
                 .allocator = null,
diff --git a/src/codegen/bundle-modules.ts b/src/codegen/bundle-modules.ts
index 4e954e76bd..037087bf15 100644
--- a/src/codegen/bundle-modules.ts
+++ b/src/codegen/bundle-modules.ts
@@ -273,6 +273,7 @@ function idToEnumName(id: string) {
 }
 
 function idToPublicSpecifierOrEnumName(id: string) {
+  if (id === "internal-for-testing.ts") return "bun:internal-for-testing"; // not in the `bun/` folder because it's added conditionally
   id = id.replace(/\.[mc]?[tj]s$/, "");
   if (id.startsWith("node/")) {
     return "node:" + id.slice(5).replaceAll(".", "/");
@@ -490,7 +491,7 @@ declare module "module" {
 
     namespace NodeJS {
       interface Require {
-        
+
 `;
 
     for (let i = 0; i < nativeStartIndex; i++) {
@@ -502,8 +503,7 @@ declare module "module" {
       let internalName = idToPublicSpecifierOrEnumName(id);
       if (internalName.startsWith("internal:")) internalName = internalName.replace(":", "/");
 
-      dts += `        (id: "${internalName}"): typeof import("${path.join(BASE, id)}").default;
-`;
+      dts += `        (id: "${internalName}"): typeof import("${path.join(BASE, id)}").default;\n`;
     }
 
     dts += `