diff --git a/tests/sys/posixshm/posixshm_test.c b/tests/sys/posixshm/posixshm_test.c
--- a/tests/sys/posixshm/posixshm_test.c
+++ b/tests/sys/posixshm/posixshm_test.c
@@ -1407,7 +1407,7 @@
 		ATF_REQUIRE(munmap(addr, ps[i] == 0));
 
 		/* Clobber an anonymous mapping with a superpage. */
-		addr1 = mmap(NULL, ps[0], PROT_READ | PROT_WRITE,
+		addr1 = mmap(NULL, ps[i], PROT_READ | PROT_WRITE,
 		    MAP_ANON | MAP_PRIVATE | MAP_ALIGNED(ffsl(ps[i]) - 1), -1,
 		    0);
 		ATF_REQUIRE_MSG(addr1 != MAP_FAILED,