diff --git a/index-scheduler/src/batch.rs b/index-scheduler/src/batch.rs
index b52d3d495..97fc14e44 100644
--- a/index-scheduler/src/batch.rs
+++ b/index-scheduler/src/batch.rs
@@ -1001,17 +1001,14 @@ impl IndexScheduler {
 
                 if let Some(primary_key) = primary_key {
                     match index.primary_key(index_wtxn)? {
-                        // if a primary key was set AND had already be defined in the index
-                        // but to a different value then we can make the whole batch fail.
-                        Some(pk) if primary_key != pk => {
+                        // if a primary key was set AND had already been defined in the index
+                        // but to a different value, we can make the whole batch fail.
+                        Some(pk) => if primary_key != pk {
                             return Err(milli::Error::from(
                                 milli::UserError::PrimaryKeyCannotBeChanged(pk.to_string()),
                             )
                             .into());
                         }
-                        // if the primary key was set and equal to the one already set for
-                        // the index then there is nothing to do.
-                        Some(_) => (),
                         // if the primary key was set and there was no primary key set for this index
                         // we set it to the received value before starting the indexing process.
                         None => {