diff --git a/tests/unistd_test.cpp b/tests/unistd_test.cpp
index 79c16d7..75b3edc 100644
--- a/tests/unistd_test.cpp
+++ b/tests/unistd_test.cpp
@@ -374,7 +374,7 @@
   close(fd);
 
   // The fd can even be a directory.
-  ASSERT_NE(-1, fd = open("/", O_RDONLY));
+  ASSERT_NE(-1, fd = open("/data", O_RDONLY));
   EXPECT_EQ(0, fn(fd));
   close(fd);