diff --git a/src/backend/access/heap/pruneheap.c b/src/backend/access/heap/pruneheap.c
index 72ce130346c..ab2ca6ccc45 100644
--- a/src/backend/access/heap/pruneheap.c
+++ b/src/backend/access/heap/pruneheap.c
@@ -1199,14 +1199,14 @@ heap_get_root_tuples(Page page, OffsetNumber *root_offsets)
 		for (;;)
 		{
 			/* Sanity check (pure paranoia) */
-			if (offnum < FirstOffsetNumber)
+			if (nextoffnum < FirstOffsetNumber)
 				break;
 
 			/*
 			 * An offset past the end of page's line pointer array is possible
 			 * when the array was truncated
 			 */
-			if (offnum > maxoff)
+			if (nextoffnum > maxoff)
 				break;
 
 			lp = PageGetItemId(page, nextoffnum);