diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 918330f71db..1e145ef92c3 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1548,8 +1548,9 @@ static inline int should_fail_alloc_page(gfp_t gfp_mask, unsigned int order)
 static bool __zone_watermark_ok(struct zone *z, int order, unsigned long mark,
 		      int classzone_idx, int alloc_flags, long free_pages)
 {
-	/* free_pages my go negative - that's OK */
+	/* free_pages may go negative - that's OK */
 	long min = mark;
+	long lowmem_reserve = z->lowmem_reserve[classzone_idx];
 	int o;
 
 	free_pages -= (1 << order) - 1;
@@ -1558,7 +1559,7 @@ static bool __zone_watermark_ok(struct zone *z, int order, unsigned long mark,
 	if (alloc_flags & ALLOC_HARDER)
 		min -= min / 4;
 
-	if (free_pages <= min + z->lowmem_reserve[classzone_idx])
+	if (free_pages <= min + lowmem_reserve)
 		return false;
 	for (o = 0; o < order; o++) {
 		/* At the next order, this order's pages become unavailable */