diff --git a/packages/runtime-core/src/devtools.ts b/packages/runtime-core/src/devtools.ts
index 870cb4748bd..5bff57a4165 100644
--- a/packages/runtime-core/src/devtools.ts
+++ b/packages/runtime-core/src/devtools.ts
@@ -123,6 +123,7 @@ export const devtoolsComponentRemoved = (
   }
 }
 
+/*! #__NO_SIDE_EFFECTS__ */
 function createDevtoolsComponentHook(hook: DevtoolsHooks) {
   return (component: ComponentInternalInstance) => {
     emit(
diff --git a/packages/server-renderer/src/helpers/ssrRenderAttrs.ts b/packages/server-renderer/src/helpers/ssrRenderAttrs.ts
index 5eb77116b19..5a7baaac3a2 100644
--- a/packages/server-renderer/src/helpers/ssrRenderAttrs.ts
+++ b/packages/server-renderer/src/helpers/ssrRenderAttrs.ts
@@ -17,7 +17,7 @@ import {
 } from '@vue/shared'
 
 // leading comma for empty string ""
-const shouldIgnoreProp = makeMap(
+const shouldIgnoreProp = /*#__PURE__*/ makeMap(
   `,key,ref,innerHTML,textContent,ref_key,ref_for`,
 )
 
diff --git a/packages/shared/src/makeMap.ts b/packages/shared/src/makeMap.ts
index f11cc407c6f..3fa2b09c94a 100644
--- a/packages/shared/src/makeMap.ts
+++ b/packages/shared/src/makeMap.ts
@@ -5,6 +5,8 @@
  * \/\*#\_\_PURE\_\_\*\/
  * So that rollup can tree-shake them if necessary.
  */
+
+/*! #__NO_SIDE_EFFECTS__ */
 export function makeMap(
   str: string,
   expectsLowerCase?: boolean,