Index: firmware/App/Services/SystemCommMessages.h
===================================================================
diff -u -r9d7ad180a18e29ba08bf65228d61b6179ddbfcca -rd3ae2d91603ae6d2d25b9abdb220cc144cf90692
--- firmware/App/Services/SystemCommMessages.h	(.../SystemCommMessages.h)	(revision 9d7ad180a18e29ba08bf65228d61b6179ddbfcca)
+++ firmware/App/Services/SystemCommMessages.h	(.../SystemCommMessages.h)	(revision d3ae2d91603ae6d2d25b9abdb220cc144cf90692)
@@ -45,7 +45,7 @@
 // MSG_ID_USER_UF_SETTINGS_CHANGE_REQUEST
 void handleChangeUFSettingsRequest( MESSAGE_T *message );
 // MSG_ID_USER_UF_SETTINGS_CHANGE_RESPONSE
-BOOL sendChangeUFSettingsResponse( BOOL accepted, F32 volume_mL, U32 time_min, F32 ufRate_mL_min, U32 timeDiff, F32 rateDiff );
+BOOL sendChangeUFSettingsResponse( BOOL accepted, F32 volume_mL, U32 time_min, F32 ufRate_mL_min, S32 timeDiff, F32 rateDiff );
 // MSG_ID_USER_CONFIRM_UF_SETTINGS_CHANGE
 void handleChangeUFSettingsConfirmation( MESSAGE_T *message );