diff --git a/contrib/pageinspect/brinfuncs.c b/contrib/pageinspect/brinfuncs.c
index 26cf78252ed..4be2225e429 100644
--- a/contrib/pageinspect/brinfuncs.c
+++ b/contrib/pageinspect/brinfuncs.c
@@ -28,6 +28,7 @@ PG_FUNCTION_INFO_V1(brin_page_items);
 PG_FUNCTION_INFO_V1(brin_metapage_info);
 PG_FUNCTION_INFO_V1(brin_revmap_data);
 
+#define IS_INDEX(r) ((r)->rd_rel->relkind == RELKIND_INDEX)
 #define IS_BRIN(r) ((r)->rd_rel->relam == BRIN_AM_OID)
 
 typedef struct brin_column_state
@@ -164,7 +165,7 @@ brin_page_items(PG_FUNCTION_ARGS)
 
 	indexRel = index_open(indexRelid, AccessShareLock);
 
-	if (!IS_BRIN(indexRel))
+	if (!IS_INDEX(indexRel) || !IS_BRIN(indexRel))
 		ereport(ERROR,
 				(errcode(ERRCODE_WRONG_OBJECT_TYPE),
 				 errmsg("\"%s\" is not a %s index",
diff --git a/contrib/pageinspect/gistfuncs.c b/contrib/pageinspect/gistfuncs.c
index e7759488c36..7062b7b423f 100644
--- a/contrib/pageinspect/gistfuncs.c
+++ b/contrib/pageinspect/gistfuncs.c
@@ -30,6 +30,7 @@ PG_FUNCTION_INFO_V1(gist_page_opaque_info);
 PG_FUNCTION_INFO_V1(gist_page_items);
 PG_FUNCTION_INFO_V1(gist_page_items_bytea);
 
+#define IS_INDEX(r) ((r)->rd_rel->relkind == RELKIND_INDEX)
 #define IS_GIST(r) ((r)->rd_rel->relam == GIST_AM_OID)
 
 
@@ -217,7 +218,7 @@ gist_page_items(PG_FUNCTION_ARGS)
 	/* Open the relation */
 	indexRel = index_open(indexRelid, AccessShareLock);
 
-	if (!IS_GIST(indexRel))
+	if (!IS_INDEX(indexRel) || !IS_GIST(indexRel))
 		ereport(ERROR,
 				(errcode(ERRCODE_WRONG_OBJECT_TYPE),
 				 errmsg("\"%s\" is not a %s index",
-- 
2.43.0