diff --git a/tracing-core/src/field.rs b/tracing-core/src/field.rs
index 90c4eaa85d..5c9a2d12a0 100644
--- a/tracing-core/src/field.rs
+++ b/tracing-core/src/field.rs
@@ -1081,6 +1081,7 @@ mod private {
     pub trait ValidLen<'a>: Borrow<[(&'a Field, Option<&'a (dyn Value + 'a)>)]> {}
 
     impl<'a, const N: usize> ValidLen<'a> for [(&'a Field, Option<&'a (dyn Value + 'a)>); N] {}
+    impl<'a> ValidLen<'a> for &[(&'a Field, Option<&'a (dyn Value + 'a)>)] {}
 }
 
 #[cfg(test)]