diff --git a/src/installer.rs b/src/installer.rs
index db2697213b..bd3253ec4c 100644
--- a/src/installer.rs
+++ b/src/installer.rs
@@ -856,31 +856,4 @@ pub fn install(config: Config, output: impl AsRef<Path>) -> Result<()> {
     install_inner(config, output.as_ref())
 }
 
-/// Convert bytes into readable string
-pub fn format_bytes(len: u64) -> String {
-    const GB: u64 = 1024 * 1024 * 1024;
-    const MB: u64 = 1024 * 1024;
-    const KB: u64 = 1024;
-
-    if len > GB {
-        format_bytes_inner(len, GB, "GB")
-    } else if len > MB {
-        format_bytes_inner(len, MB, "MB")
-    } else if len > KB {
-        format_bytes_inner(len, KB, "KB")
-    } else {
-        format!("{len} B")
-    }
-}
-
-fn format_bytes_inner(len: u64, divisor: u64, suffix: &'static str) -> String {
-    let mut s = format!("{}", len / divisor);
-    if s.len() == 1 {
-        let _ = write!(s, ".{:02}", (len % divisor) / (divisor / 100));
-    } else if s.len() == 2 {
-        let _ = write!(s, ".{:01}", (len % divisor) / (divisor / 10));
-    }
-
-    let _ = write!(s, " {suffix}");
-    s
-}
+pub use crate::format_bytes;
diff --git a/src/lib.rs b/src/lib.rs
index 216478d901..5bc8a002de 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -12,3 +12,32 @@ pub use crate::installer::*;
 pub use crate::config::file::FileConfig;
 pub use crate::config::package::PackageConfig;
 pub use crate::config::Config;
+
+use core::fmt::Write as _;
+
+pub fn format_bytes(len: u64) -> String {
+    const GB: u64 = 1024 * 1024 * 1024;
+    const MB: u64 = 1024 * 1024;
+    const KB: u64 = 1024;
+
+    fn inner(len: u64, divisor: u64, suffix: &str) -> String {
+        let mut s = format!("{}", len / divisor);
+        if s.len() == 1 {
+            let _ = write!(s, ".{:02}", (len % divisor) / (divisor / 100));
+        } else if s.len() == 2 {
+            let _ = write!(s, ".{:01}", (len % divisor) / (divisor / 10));
+        }
+        let _ = write!(s, " {suffix}");
+        s
+    }
+
+    if len > GB {
+        inner(len, GB, "GB")
+    } else if len > MB {
+        inner(len, MB, "MB")
+    } else if len > KB {
+        inner(len, KB, "KB")
+    } else {
+        format!("{len} B")
+    }
+}