diff --git a/reference/speeduino.ini b/reference/speeduino.ini
index c905c0ca..a904dabb 100644
--- a/reference/speeduino.ini
+++ b/reference/speeduino.ini
@@ -650,7 +650,7 @@ page = 6
 
 ; Flat shift
       flatSSoftWin = scalar, U08,      61,             "rpm",      100,    0.0,  100, 25500,  0
-      flatSRetard  = scalar, U08,      62,             "deg",      1.0,    0.0,  0.0,   80,   0
+      flatSRetard  = scalar, S08,      62,             "deg",      1.0,    0.0,-30.0,   80,   0
       flatSArm     = scalar, U08,      63,             "rpm",      100,    0.0,  100, 25500,  0
 
       iacCLValues  = array, U08,       64, [10],        "RPM",    10.0,  0.0,      0,  2550,     0
diff --git a/speeduino/corrections.ino b/speeduino/corrections.ino
index f31b0eb5..fbb53a42 100644
--- a/speeduino/corrections.ino
+++ b/speeduino/corrections.ino
@@ -842,7 +842,7 @@ int8_t correctionSoftLaunch(int8_t advance)
  */
 int8_t correctionSoftFlatShift(int8_t advance)
 {
-  byte ignSoftFlatValue = advance;
+  int8_t ignSoftFlatValue = advance;
 
   if(configPage6.flatSEnable && clutchTrigger && (currentStatus.clutchEngagedRPM > ((unsigned int)(configPage6.flatSArm) * 100)) && (currentStatus.RPM > (currentStatus.clutchEngagedRPM-configPage6.flatSSoftWin) ) )
   {
diff --git a/speeduino/globals.h b/speeduino/globals.h
index b245cb4f..cb341c68 100644
--- a/speeduino/globals.h
+++ b/speeduino/globals.h
@@ -1050,7 +1050,7 @@ struct config6 {
   byte flatSEnable : 1; ///< Flat shift enable
   byte baroPin : 4;
   byte flatSSoftWin;
-  byte flatSRetard;
+  int8_t flatSRetard;
   byte flatSArm;
 
   byte iacCLValues[10]; //Closed loop target RPM value