diff --git a/sdk/program/src/account_info.rs b/sdk/program/src/account_info.rs
index 084e08c807..4fafe98692 100644
--- a/sdk/program/src/account_info.rs
+++ b/sdk/program/src/account_info.rs
@@ -140,7 +140,7 @@ impl<'a> AccountInfo<'a> {
         bincode::deserialize(&self.data.borrow())
     }
 
-    pub fn serialize_data<T: serde::Serialize>(&mut self, state: &T) -> Result<(), bincode::Error> {
+    pub fn serialize_data<T: serde::Serialize>(&self, state: &T) -> Result<(), bincode::Error> {
         if bincode::serialized_size(state)? > self.data_len() as u64 {
             return Err(Box::new(bincode::ErrorKind::SizeLimit));
         }