diff --git a/lib/libc/tests/nss/getgr_test.c b/lib/libc/tests/nss/getgr_test.c
--- a/lib/libc/tests/nss/getgr_test.c
+++ b/lib/libc/tests/nss/getgr_test.c
@@ -293,6 +293,8 @@
     int (*cb)(struct group *, void *))
 {
 	struct group *grp;
+	const int limit = 1024;
+	int count = 0;
 
 	setgroupent(1);
 	while ((grp = getgrent()) != NULL) {
@@ -303,6 +305,8 @@
 		} else {
 			return (-1);
 		}
+		if (++count >= limit)
+			break;
 	}
 	endgrent();
 
diff --git a/lib/libc/tests/nss/getpw_test.c b/lib/libc/tests/nss/getpw_test.c
--- a/lib/libc/tests/nss/getpw_test.c
+++ b/lib/libc/tests/nss/getpw_test.c
@@ -240,6 +240,8 @@
     int (*cb)(struct passwd *, void *))
 {
 	struct passwd *pwd;
+	const int limit = 1024;
+	int count = 0;
 
 	setpassent(1);
 	while ((pwd = getpwent()) != NULL) {
@@ -250,6 +252,8 @@
 		} else {
 			return (-1);
 		}
+		if (++count >= limit)
+			break;
 	}
 	endpwent();
 
diff --git a/lib/libc/tests/nss/getserv_test.c b/lib/libc/tests/nss/getserv_test.c
--- a/lib/libc/tests/nss/getserv_test.c
+++ b/lib/libc/tests/nss/getserv_test.c
@@ -283,6 +283,8 @@
 servent_fill_test_data(struct servent_test_data *td)
 {
 	struct servent *serv;
+	const int limit = 1024;
+	int count = 0;
 
 	setservent(1);
 	while ((serv = getservent()) != NULL) {
@@ -290,6 +292,8 @@
 			TEST_DATA_APPEND(servent, td, serv);
 		else
 			return (-1);
+		if (++count >= limit)
+			break;
 	}
 	endservent();