diff --git a/src/linux/mem_reader.rs b/src/linux/mem_reader.rs
index 1e9fc87..e4a5041 100644
--- a/src/linux/mem_reader.rs
+++ b/src/linux/mem_reader.rs
@@ -97,7 +97,7 @@ impl MemReader {
     pub fn read_to_vec(
         &mut self,
         src: usize,
-        length: std::num::NonZero<usize>,
+        length: std::num::NonZeroUsize,
     ) -> Result<Vec<u8>, CopyFromProcessError> {
         let length = length.into();
         let layout =
@@ -258,7 +258,7 @@ impl PtraceDumper {
         src: usize,
         length: usize,
     ) -> Result<Vec<u8>, crate::errors::DumperError> {
-        let length = std::num::NonZero::new(length).ok_or_else(|| {
+        let length = std::num::NonZeroUsize::new(length).ok_or_else(|| {
             crate::errors::DumperError::CopyFromProcessError(CopyFromProcessError {
                 src,
                 child: pid,
diff --git a/src/linux/module_reader.rs b/src/linux/module_reader.rs
index 08ee818..f40e28c 100644
--- a/src/linux/module_reader.rs
+++ b/src/linux/module_reader.rs
@@ -55,7 +55,7 @@ impl<'buf> ProcessMemory<'buf> {
         match self {
             Self::Process(pr) => {
                 let error = |e| error(Some(pr.start_address), e);
-                let len = std::num::NonZero::new(length as usize)
+                let len = std::num::NonZeroUsize::new(length as usize)
                     .ok_or_else(|| error(nix::Error::EINVAL))?;
                 let proc_offset = pr
                     .start_address