diff --git a/src/SparkFunMPU9250-DMP.cpp b/src/SparkFunMPU9250-DMP.cpp
index db57b8f..58af134 100644
--- a/src/SparkFunMPU9250-DMP.cpp
+++ b/src/SparkFunMPU9250-DMP.cpp
@@ -615,9 +615,9 @@ float MPU9250_DMP::qToFloat(long number, unsigned char q)
 	unsigned long mask = 0;
 	for (int i=0; i<q; i++)
 	{
-		mask |= (1<<i);
+		mask |= (1L<<i);
 	}
-	return (number >> q) + ((number & mask) / (float) (2<<(q-1)));
+	return (number >> q) + ((number & mask) / (float) (2L<<(q-1)));
 }
 
 void MPU9250_DMP::computeEulerAngles(bool degrees)
@@ -700,4 +700,4 @@ static void tap_cb(unsigned char direction, unsigned char count)
 static void orient_cb(unsigned char orient)
 {
 	mpu9250_orientation = orient;
-}
\ No newline at end of file
+}