diff --git a/fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/functions/executable/ExecutableFunctions.java b/fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/functions/executable/ExecutableFunctions.java
index eddbcb46ddc7d20..644fe0780308d3f 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/functions/executable/ExecutableFunctions.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/functions/executable/ExecutableFunctions.java
@@ -119,7 +119,7 @@ public static Expression e() { // CHECKSTYLE IGNORE THIS LINE
         return new DoubleLiteral(Math.E);
     }
 
-    @ExecFunction(name = "pi")
+    @ExecFunction(name = "pi", argTypes = {}, returnType = "DOUBLE")
     public static Expression pi() {
         return new DoubleLiteral(Math.PI);
     }