diff --git a/tests/sys_mman_test.cpp b/tests/sys_mman_test.cpp
new file mode 100644
index 0000000..57067d7
--- /dev/null
+++ b/tests/sys_mman_test.cpp
@@ -0,0 +1,30 @@
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <gtest/gtest.h>
+
+#include <sys/mman.h>
+#include <unistd.h>
+
+TEST(sys_mman, mmap_negative) {
+  off_t off = -sysconf(_SC_PAGESIZE); // Aligned but negative.
+  ASSERT_EQ(MAP_FAILED, mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, -1, off));
+}
+
+TEST(sys_mman, mmap64_negative) {
+  off64_t off64 = -sysconf(_SC_PAGESIZE); // Aligned but negative.
+  ASSERT_EQ(MAP_FAILED, mmap64(NULL, 4096, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, -1, off64));
+}