diff --git a/src/backup/catalog.rs b/src/backup/catalog.rs
index b686fd5f..4c72ba3a 100644
--- a/src/backup/catalog.rs
+++ b/src/backup/catalog.rs
@@ -605,7 +605,7 @@ pub fn catalog_encode_i64<W: Write>(writer: &mut W, v: i64) -> Result<(), Error>
             break;
         }
         enc.push((128 | (d & 127)) as u8);
-        d = d >> 7;
+        d >>= 7;
     }
     writer.write_all(&enc)?;
 
@@ -659,7 +659,7 @@ pub fn catalog_encode_u64<W: Write>(writer: &mut W, v: u64) -> Result<(), Error>
             break;
         }
         enc.push((128 | (d & 127)) as u8);
-        d = d >> 7;
+        d >>= 7;
     }
     writer.write_all(&enc)?;
 
diff --git a/src/tape/drive/volume_statistics.rs b/src/tape/drive/volume_statistics.rs
index cf84ea9c..5657d3ef 100644
--- a/src/tape/drive/volume_statistics.rs
+++ b/src/tape/drive/volume_statistics.rs
@@ -105,8 +105,8 @@ fn decode_volume_statistics(data: &[u8]) -> Result<Lp17VolumeStatistics, Error>
         let mut value: u64 = 0;
 
         for i in 0..len {
-            value = value << 8;
-            value = value | buffer[i] as u64;
+            value <<= 8;
+            value |= buffer[i] as u64;
         }
 
         Ok(value)
diff --git a/src/tape/helpers/blocked_writer.rs b/src/tape/helpers/blocked_writer.rs
index c51beedc..961b2ed2 100644
--- a/src/tape/helpers/blocked_writer.rs
+++ b/src/tape/helpers/blocked_writer.rs
@@ -77,7 +77,7 @@ impl <W: Write> BlockedWriter<W> {
             self.bytes_written += BlockHeader::SIZE;
 
         } else {
-            self.buffer_pos = self.buffer_pos + bytes;
+            self.buffer_pos += bytes;
         }
 
         Ok(bytes)
diff --git a/src/tools/systemd/parse_time.rs b/src/tools/systemd/parse_time.rs
index a03b078b..88f5c92d 100644
--- a/src/tools/systemd/parse_time.rs
+++ b/src/tools/systemd/parse_time.rs
@@ -120,7 +120,7 @@ fn parse_weekdays_range(i: &str) -> IResult<&str, WeekDays> {
         loop {
             res |= pos;
             if pos >= end { break; }
-            pos = pos << 1;
+            pos <<= 1;
         }
         WeekDays::from_bits(res).unwrap()
     };