diff --git a/scst/src/dev_handlers/scst_vdisk.c b/scst/src/dev_handlers/scst_vdisk.c
index fefe4c3be..8ca710993 100644
--- a/scst/src/dev_handlers/scst_vdisk.c
+++ b/scst/src/dev_handlers/scst_vdisk.c
@@ -990,6 +990,18 @@ out_overflow:
 	goto out;
 }
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 37) && !defined(RHEL_MAJOR)
+/*
+ * See also patch "mm: add vzalloc() and vzalloc_node() helpers" (commit
+ * e1ca7788dec6773b1a2bce51b7141948f2b8bccf).
+ */
+static void *vzalloc(unsigned long size)
+{
+	return __vmalloc(size, GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO,
+			 PAGE_KERNEL);
+}
+#endif
+
 static int vdev_save_mode_pages(const struct scst_vdisk_dev *virt_dev)
 {
 	int res, rc, offs;