diff --git a/tests/unistd_test.cpp b/tests/unistd_test.cpp
index 109b92c..a81f112 100644
--- a/tests/unistd_test.cpp
+++ b/tests/unistd_test.cpp
@@ -759,6 +759,7 @@
   EXPECT_GT(_POSIX_TZNAME_MAX, 0);
   EXPECT_NE(-1, _POSIX_VDISABLE);
 
+  EXPECT_EQ(_POSIX_VERSION, _POSIX2_VERSION);
   EXPECT_GT(_POSIX2_BC_BASE_MAX, 0);
   EXPECT_GT(_POSIX2_BC_DIM_MAX, 0);
   EXPECT_GT(_POSIX2_BC_SCALE_MAX, 0);
@@ -784,7 +785,6 @@
   EXPECT_EQ(-1, _POSIX_SPAWN);
   EXPECT_EQ(-1, _POSIX_THREAD_ROBUST_PRIO_INHERIT);
 
-  EXPECT_EQ(-1, _POSIX2_VERSION);
   EXPECT_EQ(-1, _POSIX2_CHAR_TERM);
   EXPECT_EQ(-1, _POSIX2_C_DEV);
   EXPECT_EQ(-1, _POSIX2_LOCALEDEF);