diff --git a/capsules/extra/src/bme280.rs b/capsules/extra/src/bme280.rs
index 1df4a66f81..ffacf8e616 100644
--- a/capsules/extra/src/bme280.rs
+++ b/capsules/extra/src/bme280.rs
@@ -272,10 +272,10 @@ impl<'a, I: I2CDevice> I2CClient for Bme280<'a, I> {
                         let calib = self.calibration.get();
 
                         // note: per datasheet, measurement is 20-bit two's complement
-                        let adc_temperature: i32 = (((buffer[0] as usize) << 12
+                        let adc_temperature: i32 = ((((buffer[0] as usize) << 12
                             | (buffer[1] as usize) << 4
-                            | (((buffer[2] as usize) >> 4) & 0x0F) << 12)
-                            as i32)
+                            | (((buffer[2] as usize) >> 4) & 0x0F))
+                            << 12) as i32)
                             >> 12; // ensure sign extension
 
                         if adc_temperature == 0 {
diff --git a/capsules/extra/src/bmp280.rs b/capsules/extra/src/bmp280.rs
index 0a7939b110..303524fd61 100644
--- a/capsules/extra/src/bmp280.rs
+++ b/capsules/extra/src/bmp280.rs
@@ -77,8 +77,7 @@ impl CalibrationData {
         }
     }
 
-    fn temp_from_raw(&self, raw_temp: i32) -> i32 {
-        let temp = raw_temp as i32; // guaranteed to succeed because raw temp has only 20 significant bits maximum.
+    fn temp_from_raw(&self, temp: i32) -> i32 {
         let dig_t1 = self.dig_t1 as i32; // same, 16-bits
         let dig_t2 = self.dig_t2 as i32; // same, 16-bits
         let dig_t3 = self.dig_t3 as i32; // same, 16-bits