diff --git a/src/test/modules/test_radixtree/test_radixtree.c b/src/test/modules/test_radixtree/test_radixtree.c
index d301c60d00..a92d353fa7 100644
--- a/src/test/modules/test_radixtree/test_radixtree.c
+++ b/src/test/modules/test_radixtree/test_radixtree.c
@@ -151,6 +151,7 @@ test_empty(void)
 	EXPECT_TRUE(rt_find(radixtree, 1) == NULL);
 	EXPECT_TRUE(rt_find(radixtree, PG_UINT64_MAX) == NULL);
 	EXPECT_FALSE(rt_delete(radixtree, 0));
+	EXPECT_FALSE(rt_delete(radixtree, PG_UINT64_MAX));
 	EXPECT_TRUE(rt_num_entries(radixtree) == 0);
 
 	/* Iterating on an empty tree should not return anything */