diff --git a/libretroshare/src/serialiser/rswikiitems.cc b/libretroshare/src/serialiser/rswikiitems.cc
index 5988e2c82..fa4b2be72 100644
--- a/libretroshare/src/serialiser/rswikiitems.cc
+++ b/libretroshare/src/serialiser/rswikiitems.cc
@@ -50,7 +50,7 @@ uint32_t RsGxsWikiSerialiser::size(RsItem *item)
 	{
 		return sizeGxsWikiCommentItem(com_item);
 	}
-	return NULL;
+    return 0;
 }
 
 bool RsGxsWikiSerialiser::serialise(RsItem *item, void *data, uint32_t *size)
diff --git a/libretroshare/src/serialiser/rswireitems.cc b/libretroshare/src/serialiser/rswireitems.cc
index 5f3076629..68ec68741 100644
--- a/libretroshare/src/serialiser/rswireitems.cc
+++ b/libretroshare/src/serialiser/rswireitems.cc
@@ -45,7 +45,7 @@ uint32_t RsGxsWireSerialiser::size(RsItem *item)
 	{
 		return sizeGxsWirePulseItem(snap_item);
 	}
-	return NULL;
+    return 0;
 }
 
 bool RsGxsWireSerialiser::serialise(RsItem *item, void *data, uint32_t *size)