diff --git a/doc/src/sgml/indexam.sgml b/doc/src/sgml/indexam.sgml
index beb99d1831a..d758a4987dc 100644
--- a/doc/src/sgml/indexam.sgml
+++ b/doc/src/sgml/indexam.sgml
@@ -614,7 +614,8 @@ amendscan (IndexScanDesc scan);
 </programlisting>
    End a scan and release resources.  The <literal>scan</literal> struct itself
    should not be freed, but any locks or pins taken internally by the
-   access method must be released.
+   access method must be released, as well as any other memory allocated
+   by <function>ambeginscan</function> and other scan-related functions.
   </para>
 
   <para>
diff --git a/src/backend/access/spgist/spgscan.c b/src/backend/access/spgist/spgscan.c
index 5260d5017d1..aede1a76cbf 100644
--- a/src/backend/access/spgist/spgscan.c
+++ b/src/backend/access/spgist/spgscan.c
@@ -240,6 +240,14 @@ spgendscan(IndexScanDesc scan)
 
 	MemoryContextDelete(so->tempCxt);
 	MemoryContextDelete(so->traversalCxt);
+
+	if (so->keyData)
+		pfree(so->keyData);
+
+	if (so->state.deadTupleStorage)
+		pfree(so->state.deadTupleStorage);
+
+	pfree(so);
 }
 
 /*