diff --git a/tests/sys/vm/shared_shadow_inval_test.c b/tests/sys/vm/shared_shadow_inval_test.c
--- a/tests/sys/vm/shared_shadow_inval_test.c
+++ b/tests/sys/vm/shared_shadow_inval_test.c
@@ -365,7 +365,7 @@
 	ATF_REQUIRE(sysctllen >= sizeof(size_t));
 
 	pagesize = pagesizes[0];
-	largepagesize = sysctllen >= 2 * sizeof(size_t) ?
+	largepagesize = sysctllen >= 2 * sizeof(size_t) && pagesizes[1] != 0 ?
 	    pagesizes[1] : 2 * 1024 * 1024;
 
 	for (unsigned int i = 0; i <= FLAG_MASK; i++) {