diff --git a/pinio.c b/pinio.c
index 45f2736..db4f72a 100644
--- a/pinio.c
+++ b/pinio.c
@@ -119,7 +119,11 @@ void power_on() {
 	if (ps_is_on == 0) {
 		#ifdef	PS_ON_PIN
       SET_OUTPUT(PS_ON_PIN);
-			WRITE(PS_ON_PIN, 0);
+      #ifdef PS_INVERT_ON
+        WRITE(PS_ON_PIN, 1);
+      #else
+        WRITE(PS_ON_PIN, 0);
+      #endif
 			delay_ms(500);
 		#endif
     #ifdef PS_MOSFET_PIN