diff --git a/src/wasi.rs b/src/wasi.rs
index 82d3f37c..ef47b18b 100644
--- a/src/wasi.rs
+++ b/src/wasi.rs
@@ -28,9 +28,12 @@ pub fn getrandom_inner(dest: &mut [MaybeUninit<u8>]) -> Result<(), Error> {
     let ret = unsafe { random_get(dest.as_mut_ptr() as i32, dest.len() as i32) };
     match ret {
         0 => Ok(()),
-        code => u32::try_from(code)
-            .map(Error::from_os_error)
-            .unwrap_or(Error::UNEXPECTED),
+        code => {
+            let err = u32::try_from(code)
+                .map(Error::from_os_error)
+                .unwrap_or(Error::UNEXPECTED);
+            Err(err)
+        }
     }
 }