diff --git a/src/txn/txn_timestamp.c b/src/txn/txn_timestamp.c
index 7ebb848c2..42f2da9b8 100644
--- a/src/txn/txn_timestamp.c
+++ b/src/txn/txn_timestamp.c
@@ -547,6 +547,14 @@ __wt_txn_validate_commit_timestamp(WT_SESSION_IMPL *session, wt_timestamp_t *com
          * to roundup timestamps of a prepared transaction, then we will roundup the commit
          * timestamp to the prepare timestamp of the transaction.
          */
+        
+        if (commit_ts != txn->first_commit_timestamp && txn->first_commit_timestamp != 0){
+            WT_RET_MSG(
+              session, EINVAL, "cannot set multiple commit timestamps for prepared transactions, commit timestamp %s, first commit timestamp %s.",
+                    __wt_timestamp_to_string(commit_ts, ts_string[0]),
+                    __wt_timestamp_to_string(txn->first_commit_timestamp, ts_string[1]) );
+        }
+
         if (txn->prepare_timestamp > commit_ts) {
             if (!F_ISSET(txn, WT_TXN_TS_ROUND_PREPARED))
                 WT_RET_MSG(session, EINVAL,