diff --git a/be/src/exprs/expr.h b/be/src/exprs/expr.h
index d947cf8e34..85717410cc 100644
--- a/be/src/exprs/expr.h
+++ b/be/src/exprs/expr.h
@@ -396,7 +396,7 @@ protected:
         ExprContext* ctx, RuntimeState* state, int varargs_buffer_size);
 
     /// Cache entry for the library implementing this function.
-    UserFunctionCacheEntry* _cache_entry;
+    UserFunctionCacheEntry* _cache_entry = nullptr;
 
     // function opcode