RPM Interrupt speed limit

Projects General Guidance
11 
   if (message = 's')
   {
     {
       if (rpmcount >= 2) 
       { 
         //Update RPM every 20 counts, increase this for better RPM resolution,
         //decrease for faster update
         rpm = 30*1000/(millis() - timeold)*rpmcount;
         timeold = millis();
         rpmcount = 0;
         Serial.println(rpm,DEC);
       }
     }

  }

Maybe you need some more curly braces here...