diff --git a/pkcs1/src/private_key.rs b/pkcs1/src/private_key.rs
index e44b75c1d..8a87dd747 100644
--- a/pkcs1/src/private_key.rs
+++ b/pkcs1/src/private_key.rs
@@ -184,13 +184,7 @@ impl<'a> fmt::Debug for RsaPrivateKey<'a> {
             .field("version", &self.version())
             .field("modulus", &self.modulus)
             .field("public_exponent", &self.public_exponent)
-            .field("private_exponent", &"...")
-            .field("prime1", &"...")
-            .field("prime2", &"...")
-            .field("exponent1", &"...")
-            .field("exponent2", &"...")
-            .field("coefficient", &"...")
-            .finish() // TODO: use `finish_non_exhaustive` when stable
+            .finish_non_exhaustive()
     }
 }
 
diff --git a/pkcs8/src/encrypted_private_key_info.rs b/pkcs8/src/encrypted_private_key_info.rs
index 101892d97..630cdb49d 100644
--- a/pkcs8/src/encrypted_private_key_info.rs
+++ b/pkcs8/src/encrypted_private_key_info.rs
@@ -106,6 +106,6 @@ impl<'a> fmt::Debug for EncryptedPrivateKeyInfo<'a> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         f.debug_struct("EncryptedPrivateKeyInfo")
             .field("encryption_algorithm", &self.encryption_algorithm)
-            .finish() // TODO(tarcieri): use `finish_non_exhaustive` when stable
+            .finish_non_exhaustive()
     }
 }
diff --git a/pkcs8/src/private_key_info.rs b/pkcs8/src/private_key_info.rs
index abedadcbc..96bac9678 100644
--- a/pkcs8/src/private_key_info.rs
+++ b/pkcs8/src/private_key_info.rs
@@ -229,7 +229,7 @@ impl<'a> fmt::Debug for PrivateKeyInfo<'a> {
             .field("version", &self.version())
             .field("algorithm", &self.algorithm)
             .field("public_key", &self.public_key)
-            .finish() // TODO: use `finish_non_exhaustive` when stable
+            .finish_non_exhaustive()
     }
 }
 
diff --git a/sec1/src/private_key.rs b/sec1/src/private_key.rs
index ff8d507ac..17ea57d22 100644
--- a/sec1/src/private_key.rs
+++ b/sec1/src/private_key.rs
@@ -129,6 +129,6 @@ impl<'a> fmt::Debug for EcPrivateKey<'a> {
         f.debug_struct("EcPrivateKey")
             .field("parameters", &self.parameters)
             .field("public_key", &self.public_key)
-            .finish() // TODO: use `finish_non_exhaustive` when stable
+            .finish_non_exhaustive()
     }
 }