diff --git a/speeduino/utils.ino b/speeduino/utils.ino
index 773a8bfa..dcdd04d2 100644
--- a/speeduino/utils.ino
+++ b/speeduino/utils.ino
@@ -278,8 +278,8 @@ void setPinMapping(byte boardID)
       //Pin mappings as per the MX5 PNP shield
       pinInjector1 = 11; //Output pin injector 1 is on
       pinInjector2 = 10; //Output pin injector 2 is on
-      pinInjector3 = 8; //Output pin injector 3 is on
-      pinInjector4 = 9; //Output pin injector 4 is on
+      pinInjector3 = 9; //Output pin injector 3 is on
+      pinInjector4 = 8; //Output pin injector 4 is on
       pinInjector5 = 14; //Output pin injector 5 is on
       pinCoil1 = 39; //Pin for coil 1
       pinCoil2 = 41; //Pin for coil 2