diff --git a/src/backend/catalog/partition.c b/src/backend/catalog/partition.c
index 67cb3402833..ad6704079ff 100644
--- a/src/backend/catalog/partition.c
+++ b/src/backend/catalog/partition.c
@@ -508,7 +508,7 @@ RelationBuildPartitionDesc(Relation rel)
 						boundinfo->null_index = mapping[null_index];
 					}
 
-					/* All partition must now have a valid mapping */
+					/* All partitions must now have a valid mapping */
 					Assert(next_index == nparts);
 					break;
 				}