diff --git a/contrib/bloom/blinsert.c b/contrib/bloom/blinsert.c
index d37ceef753..c34a640d1c 100644
--- a/contrib/bloom/blinsert.c
+++ b/contrib/bloom/blinsert.c
@@ -63,7 +63,6 @@ flushCachedPage(Relation index, BloomBuildState *buildstate)
 static void
 initCachedPage(BloomBuildState *buildstate)
 {
-	memset(buildstate->data.data, 0, BLCKSZ);
 	BloomInitPage(buildstate->data.data, 0);
 	buildstate->count = 0;
 }
diff --git a/contrib/bloom/blutils.c b/contrib/bloom/blutils.c
index 1e505b1da5..754de008d4 100644
--- a/contrib/bloom/blutils.c
+++ b/contrib/bloom/blutils.c
@@ -411,7 +411,6 @@ BloomInitPage(Page page, uint16 flags)
 	PageInit(page, BLCKSZ, sizeof(BloomPageOpaqueData));
 
 	opaque = BloomPageGetOpaque(page);
-	memset(opaque, 0, sizeof(BloomPageOpaqueData));
 	opaque->flags = flags;
 	opaque->bloom_page_id = BLOOM_PAGE_ID;
 }
diff --git a/src/backend/access/gin/ginutil.c b/src/backend/access/gin/ginutil.c
index 6b9b04cf42..cdd626ff0a 100644
--- a/src/backend/access/gin/ginutil.c
+++ b/src/backend/access/gin/ginutil.c
@@ -348,7 +348,6 @@ GinInitPage(Page page, uint32 f, Size pageSize)
 	PageInit(page, pageSize, sizeof(GinPageOpaqueData));
 
 	opaque = GinPageGetOpaque(page);
-	memset(opaque, 0, sizeof(GinPageOpaqueData));
 	opaque->flags = f;
 	opaque->rightlink = InvalidBlockNumber;
 }
diff --git a/src/backend/access/gist/gistutil.c b/src/backend/access/gist/gistutil.c
index 1ff1bf816f..8dcd53c457 100644
--- a/src/backend/access/gist/gistutil.c
+++ b/src/backend/access/gist/gistutil.c
@@ -761,8 +761,6 @@ gistinitpage(Page page, uint32 f)
 	PageInit(page, pageSize, sizeof(GISTPageOpaqueData));
 
 	opaque = GistPageGetOpaque(page);
-	/* page was already zeroed by PageInit, so this is not needed: */
-	/* memset(&(opaque->nsn), 0, sizeof(GistNSN)); */
 	opaque->rightlink = InvalidBlockNumber;
 	opaque->flags = f;
 	opaque->gist_page_id = GIST_PAGE_ID;
diff --git a/src/backend/access/spgist/spgutils.c b/src/backend/access/spgist/spgutils.c
index 72cbde7e0b..8d99c9b762 100644
--- a/src/backend/access/spgist/spgutils.c
+++ b/src/backend/access/spgist/spgutils.c
@@ -677,9 +677,8 @@ SpGistInitPage(Page page, uint16 f)
 {
 	SpGistPageOpaque opaque;
 
-	PageInit(page, BLCKSZ, MAXALIGN(sizeof(SpGistPageOpaqueData)));
+	PageInit(page, BLCKSZ, sizeof(SpGistPageOpaqueData));
 	opaque = SpGistPageGetOpaque(page);
-	memset(opaque, 0, sizeof(SpGistPageOpaqueData));
 	opaque->flags = f;
 	opaque->spgist_page_id = SPGIST_PAGE_ID;
 }