diff --git a/contrib/sepgsql/selinux.c b/contrib/sepgsql/selinux.c
index 0652e294b7f..baf92b6f6db 100644
--- a/contrib/sepgsql/selinux.c
+++ b/contrib/sepgsql/selinux.c
@@ -830,7 +830,7 @@ sepgsql_compute_avd(const char *scontext,
  * given security context.
  *
  * scontext: security context of the subject (mostly, peer process).
- * tcontext: security context of the the upper database object.
+ * tcontext: security context of the upper database object.
  * tclass: class code (SEPG_CLASS_*) of the new object in creation
  */
 char *
diff --git a/src/backend/access/gist/gistget.c b/src/backend/access/gist/gistget.c
index 73551eca3f6..c790ad6ffb4 100644
--- a/src/backend/access/gist/gistget.c
+++ b/src/backend/access/gist/gistget.c
@@ -258,7 +258,7 @@ gistScanPage(IndexScanDesc scan, GISTSearchItem *pageItem, double *myDistances,
 	/*
 	 * Check if we need to follow the rightlink. We need to follow it if the
 	 * page was concurrently split since we visited the parent (in which case
-	 * parentlsn < nsn), or if the the system crashed after a page split but
+	 * parentlsn < nsn), or if the system crashed after a page split but
 	 * before the downlink was inserted into the parent.
 	 */
 	if (!XLogRecPtrIsInvalid(pageItem->data.parentlsn) &&
diff --git a/src/include/catalog/objectaccess.h b/src/include/catalog/objectaccess.h
index 9763280177b..a5158e2bc9c 100644
--- a/src/include/catalog/objectaccess.h
+++ b/src/include/catalog/objectaccess.h
@@ -15,7 +15,7 @@
  * performing certain actions on a SQL object.	This is intended as
  * infrastructure for security or logging pluggins.
  *
- * OAT_POST_CREATE should be invoked just after the the object is created.
+ * OAT_POST_CREATE should be invoked just after the object is created.
  * Typically, this is done after inserting the primary catalog records and
  * associated dependencies.
  *
diff --git a/src/pl/plpython/plpy_typeio.c b/src/pl/plpython/plpy_typeio.c
index c503d2b2dd1..c5f6c4e5a3e 100644
--- a/src/pl/plpython/plpy_typeio.c
+++ b/src/pl/plpython/plpy_typeio.c
@@ -267,7 +267,7 @@ PLy_output_record_funcs(PLyTypeInfo *arg, TupleDesc desc)
 
 	/*
 	 * it should change is_rowtype to 1, so we won't go through this again
-	 * unless the the output record description changes
+	 * unless the output record description changes
 	 */
 	Assert(arg->is_rowtype == 1);
 }