diff --git a/Cargo.toml b/Cargo.toml
index 12cfa31f4d..33a3776e39 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -123,7 +123,6 @@ float_arithmetic = "allow"
 indexing_slicing = "allow"
 let_unit_value = "allow"
 match_wild_err_arm = "allow"
-missing_fields_in_debug = "allow" # TODO: use finish_non_exhaustive
 multiple_inherent_impl = "allow"
 multiple_unsafe_ops_per_block = "allow"
 needless_pass_by_value = "allow"
diff --git a/src/proto/h1/conn.rs b/src/proto/h1/conn.rs
index 69ca50b1a4..11059cd4e3 100644
--- a/src/proto/h1/conn.rs
+++ b/src/proto/h1/conn.rs
@@ -1016,7 +1016,7 @@ impl fmt::Debug for State {
 
         // Purposefully leaving off other fields..
 
-        builder.finish()
+        builder.finish_non_exhaustive()
     }
 }
 
diff --git a/src/proto/h1/io.rs b/src/proto/h1/io.rs
index 5833004768..ab7438a28b 100644
--- a/src/proto/h1/io.rs
+++ b/src/proto/h1/io.rs
@@ -47,7 +47,7 @@ where
         f.debug_struct("Buffered")
             .field("read_buf", &self.read_buf)
             .field("write_buf", &self.write_buf)
-            .finish()
+            .finish_non_exhaustive()
     }
 }
 
@@ -596,7 +596,7 @@ impl<B: Buf> fmt::Debug for WriteBuf<B> {
         f.debug_struct("WriteBuf")
             .field("remaining", &self.remaining())
             .field("strategy", &self.strategy)
-            .finish()
+            .finish_non_exhaustive()
     }
 }