diff --git a/util/vfio-helpers.c b/util/vfio-helpers.c
index 006674c916..1d9272efa4 100644
--- a/util/vfio-helpers.c
+++ b/util/vfio-helpers.c
@@ -522,8 +522,7 @@ static IOVAMapping *qemu_vfio_add_mapping(QEMUVFIOState *s,
 
     assert(index >= 0);
     s->nr_mappings++;
-    s->mappings = g_realloc_n(s->mappings, sizeof(s->mappings[0]),
-                              s->nr_mappings);
+    s->mappings = g_renew(IOVAMapping, s->mappings, s->nr_mappings);
     insert = &s->mappings[index];
     shift = s->nr_mappings - index - 1;
     if (shift) {
@@ -577,8 +576,7 @@ static void qemu_vfio_undo_mapping(QEMUVFIOState *s, IOVAMapping *mapping,
     memmove(mapping, &s->mappings[index + 1],
             sizeof(s->mappings[0]) * (s->nr_mappings - index - 1));
     s->nr_mappings--;
-    s->mappings = g_realloc_n(s->mappings, sizeof(s->mappings[0]),
-                              s->nr_mappings);
+    s->mappings = g_renew(IOVAMapping, s->mappings, s->nr_mappings);
 }
 
 /* Check if the mapping list is (ascending) ordered. */