diff --git a/packages/compiler-sfc/src/compileScript.ts b/packages/compiler-sfc/src/compileScript.ts
index 5a77e8a9463..a21f94cba71 100644
--- a/packages/compiler-sfc/src/compileScript.ts
+++ b/packages/compiler-sfc/src/compileScript.ts
@@ -2135,7 +2135,7 @@ function processExp(exp: string, dir?: string): string {
     if (dir === 'slot') {
       exp = `(${exp})=>{}`
     } else if (dir === 'on') {
-      exp = `()=>{${exp}}`
+      exp = `()=>{return ${exp}}`
     } else if (dir === 'for') {
       const inMatch = exp.match(forAliasRE)
       if (inMatch) {