diff --git a/Cargo.lock b/Cargo.lock
index 28fed612..f29b3d09 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -16,9 +16,6 @@ name = "arbitrary"
 version = "1.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "dde20b3d026af13f561bdd0f15edf01fc734f0dafcedbaf42bba506a9517f223"
-dependencies = [
- "derive_arbitrary",
-]
 
 [[package]]
 name = "bytesize"
@@ -37,17 +34,6 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
-[[package]]
-name = "derive_arbitrary"
-version = "1.4.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "30542c1ad912e0e3d22a1935c290e12e8a29d704a420177a31faad4a601a0800"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn",
-]
-
 [[package]]
 name = "env_logger"
 version = "0.8.4"
diff --git a/Cargo.toml b/Cargo.toml
index a71ef63c..2b1fdef1 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -20,7 +20,7 @@ arbitrary = ["dep:arbitrary"]
 serde = ["dep:serde"]
 
 [dependencies]
-arbitrary = { version = "1", features = ["derive"], optional = true }
+arbitrary = { version = "1", optional = true }
 serde = { version = "1", optional = true }
 
 [dev-dependencies]
diff --git a/src/arbitrary.rs b/src/arbitrary.rs
new file mode 100644
index 00000000..54b4e388
--- /dev/null
+++ b/src/arbitrary.rs
@@ -0,0 +1,13 @@
+use arbitrary::{Arbitrary, Unstructured};
+
+use crate::ByteSize;
+
+impl Arbitrary<'_> for ByteSize {
+    fn arbitrary(u: &mut Unstructured<'_>) -> arbitrary::Result<Self> {
+        Ok(ByteSize(u64::arbitrary(u)?))
+    }
+
+    fn size_hint(depth: usize) -> (usize, Option<usize>) {
+        u64::size_hint(depth)
+    }
+}
diff --git a/src/lib.rs b/src/lib.rs
index 050122d0..11f838a3 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -40,6 +40,8 @@
 //! assert_eq!(ByteSize::gb(996), minus);
 //! ```
 
+#[cfg(feature = "arbitrary")]
+mod arbitrary;
 mod parse;
 #[cfg(feature = "serde")]
 mod serde;
@@ -136,7 +138,6 @@ pub fn pib<V: Into<u64>>(size: V) -> u64 {
 
 /// Byte size representation
 #[derive(Copy, Clone, PartialEq, PartialOrd, Eq, Ord, Hash, Default)]
-#[cfg_attr(feature = "arbitrary", derive(arbitrary::Arbitrary))]
 pub struct ByteSize(pub u64);
 
 impl ByteSize {
@@ -400,7 +401,7 @@ mod property_tests {
         }
 
         fn to_string_never_large(size: ByteSize) -> bool {
-            size.to_string().len() < 10
+            size.to_string().len() < 11
         }
 
         // // currently fails on input like "14.0 EiB"