diff --git a/packages/theme-chalk/src/common/transition.scss b/packages/theme-chalk/src/common/transition.scss
index 155da975ba..5546781d6a 100644
--- a/packages/theme-chalk/src/common/transition.scss
+++ b/packages/theme-chalk/src/common/transition.scss
@@ -87,8 +87,8 @@
     var(--el-transition-duration) padding-bottom ease-in-out;
 }
 
-.el-collapse-transition-leave-active,
-.el-collapse-transition-enter-active {
+.#{$namespace}-collapse-transition-leave-active,
+.#{$namespace}-collapse-transition-enter-active {
   transition: var(--el-transition-duration) max-height ease-in-out,
     var(--el-transition-duration) padding-top ease-in-out,
     var(--el-transition-duration) padding-bottom ease-in-out;