diff --git a/core/src/parquet/read/values.rs b/core/src/parquet/read/values.rs
index 9d9bbb3c9e..5f57591649 100644
--- a/core/src/parquet/read/values.rs
+++ b/core/src/parquet/read/values.rs
@@ -455,6 +455,7 @@ macro_rules! make_int_variant_impl {
 
                 while num - i >= 32 {
                     unsafe {
+                        // TODO this is unsafe and panics with Rust 1.78
                         let in_slice = std::slice::from_raw_parts(in_ptr, 32);
 
                         for n in 0..32 {