diff --git a/cpu-miner.c b/cpu-miner.c
index 6bacef7..93e871d 100644
--- a/cpu-miner.c
+++ b/cpu-miner.c
@@ -998,8 +998,8 @@ int main(int argc, char *argv[])
 	SYSTEM_INFO sysinfo;
 	GetSystemInfo(&sysinfo);
 	num_processors = sysinfo.dwNumberOfProcessors;
-#elif defined(_SC_NPROCESSORS_ONLN)
-	num_processors = sysconf(_SC_NPROCESSORS_ONLN);
+#elif defined(_SC_NPROCESSORS_CONF)
+	num_processors = sysconf(_SC_NPROCESSORS_CONF);
 #elif defined(HW_NCPU)
 	int req[] = { CTL_HW, HW_NCPU };
 	size_t len = sizeof(num_processors);