diff --git a/CMakeLists.txt b/CMakeLists.txt
index 979fb63..5bfd5e5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -265,7 +265,7 @@ elseif (HAVE__SNPRINTF)
 endif () 
 
 check_c_source_compiles ("int main() { unsigned long val; __sync_bool_compare_and_swap(&val, 0, 1); return 0; } " HAVE_SYNC_BUILTINS)
-check_c_source_compiles ("int main() { char l; unsigned long v; __atomic_test_and_set(&l, __ATOMIC_RELAXED); __atomic_store_n(&v, 1, __ATOMIC_ACQ_REL); __atomic_load_n(&v, __ATOMIC_ACQUIRE); return 0; }" HAVE_ATOMIC_BUILTINS)
+check_c_source_compiles ("int main() { char l; unsigned long v; __atomic_test_and_set(&l, __ATOMIC_RELAXED); __atomic_store_n(&v, 1, __ATOMIC_RELEASE); __atomic_load_n(&v, __ATOMIC_ACQUIRE); return 0; }" HAVE_ATOMIC_BUILTINS)
 
 # Create pkg-conf file.
 # (We use the same files as ./configure does, so we
diff --git a/configure.ac b/configure.ac
index 1dffd48..cc7aec5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -47,7 +47,7 @@ AC_MSG_RESULT([$have_sync_builtins])
 AC_MSG_CHECKING([for gcc __atomic builtins])
 have_atomic_builtins=no
 AC_TRY_LINK(
-  [], [char l; unsigned long v; __atomic_test_and_set(&l, __ATOMIC_RELAXED); __atomic_store_n(&v, 1, __ATOMIC_ACQ_REL); __atomic_load_n(&v, __ATOMIC_ACQUIRE);],
+  [], [char l; unsigned long v; __atomic_test_and_set(&l, __ATOMIC_RELAXED); __atomic_store_n(&v, 1, __ATOMIC_RELEASE); __atomic_load_n(&v, __ATOMIC_ACQUIRE);],
   [have_atomic_builtins=yes],
 )
 if test "x$have_atomic_builtins" = "xyes"; then