diff --git a/tests/fcntl_test.cpp b/tests/fcntl_test.cpp
index 3fd0a8c..b62b670 100644
--- a/tests/fcntl_test.cpp
+++ b/tests/fcntl_test.cpp
@@ -196,7 +196,7 @@
 }
 
 TEST(fcntl, tee) {
-  char expected[256];
+  char expected[BUFSIZ];
   FILE* expected_fp = fopen("/proc/version", "r");
   ASSERT_TRUE(expected_fp != NULL);
   ASSERT_TRUE(fgets(expected, sizeof(expected), expected_fp) != NULL);