diff --git a/src/backend/access/gist/gistvalidate.c b/src/backend/access/gist/gistvalidate.c
index b885fa2b25..31cc4f0a21 100644
--- a/src/backend/access/gist/gistvalidate.c
+++ b/src/backend/access/gist/gistvalidate.c
@@ -131,7 +131,7 @@ gistvalidate(Oid opclassoid)
 											2, 2, INTERNALOID, INTERNALOID);
 				break;
 			case GIST_EQUAL_PROC:
-				ok = check_amproc_signature(procform->amproc, INTERNALOID, false,
+				ok = check_amproc_signature(procform->amproc, INTERNALOID, true,
 											3, 3, opckeytype, opckeytype,
 											INTERNALOID);
 				break;