diff --git a/tests/headers/posix/unistd_h.c b/tests/headers/posix/unistd_h.c
index f66609d..fdd7bde 100644
--- a/tests/headers/posix/unistd_h.c
+++ b/tests/headers/posix/unistd_h.c
@@ -221,6 +221,9 @@
   MACRO(_SC_MQ_OPEN_MAX);
   MACRO(_SC_MQ_PRIO_MAX);
   MACRO(_SC_NGROUPS_MAX);
+#if defined(__BIONIC__) // New in POSIX 2024.
+  MACRO(_SC_NSIG);
+#endif
   MACRO(_SC_OPEN_MAX);
   MACRO(_SC_PAGE_SIZE);
   MACRO(_SC_PAGESIZE);
diff --git a/tests/unistd_test.cpp b/tests/unistd_test.cpp
index 3143c23..c28a46e 100644
--- a/tests/unistd_test.cpp
+++ b/tests/unistd_test.cpp
@@ -1000,6 +1000,9 @@
   VERIFY_SYSCONF_POSITIVE(_SC_EXPR_NEST_MAX);
   VERIFY_SYSCONF_POSITIVE(_SC_LINE_MAX);
   VerifySysconf(_SC_NGROUPS_MAX, "_SC_NGROUPS_MAX", [](long v){return v >= 0 && v <= NGROUPS_MAX;});
+#if defined(__BIONIC__) || defined(_SC_NSIG) // New in POSIX 2024.
+  EXPECT_EQ(NSIG, sysconf(_SC_NSIG));
+#endif
   VERIFY_SYSCONF_POSITIVE(_SC_OPEN_MAX);
   VERIFY_SYSCONF_POSITIVE(_SC_PASS_MAX);
   VERIFY_SYSCONF_POSIX_VERSION(_SC_2_C_BIND);