diff --git a/src/uu/head/src/parse.rs b/src/uu/head/src/parse.rs
index 7e36594b5..f6f291814 100644
--- a/src/uu/head/src/parse.rs
+++ b/src/uu/head/src/parse.rs
@@ -113,7 +113,7 @@ pub fn parse_num(src: &str) -> Result<(usize, bool), ParseSizeError> {
         return Err(ParseSizeError::ParseFailure(src.to_string()));
     }
 
-    parse_size(&size_string).map(|n| (n, all_but_last))
+    parse_size(size_string).map(|n| (n, all_but_last))
 }
 
 #[cfg(test)]
diff --git a/src/uu/split/src/split.rs b/src/uu/split/src/split.rs
index b905a4592..0d5543d8b 100644
--- a/src/uu/split/src/split.rs
+++ b/src/uu/split/src/split.rs
@@ -278,7 +278,7 @@ struct ByteSplitter {
 impl ByteSplitter {
     fn new(settings: &Settings) -> ByteSplitter {
         let size_string = &settings.strategy_param;
-        let size_num = match parse_size(&size_string) {
+        let size_num = match parse_size(size_string) {
             Ok(n) => n,
             Err(e) => crash!(1, "invalid number of bytes: {}", e.to_string()),
         };
diff --git a/src/uu/tail/src/tail.rs b/src/uu/tail/src/tail.rs
index 75cc43db1..8950886a2 100644
--- a/src/uu/tail/src/tail.rs
+++ b/src/uu/tail/src/tail.rs
@@ -419,5 +419,5 @@ fn parse_num(src: &str) -> Result<(usize, bool), ParseSizeError> {
         return Err(ParseSizeError::ParseFailure(src.to_string()));
     }
 
-    parse_size(&size_string).map(|n| (n, starting_with))
+    parse_size(size_string).map(|n| (n, starting_with))
 }