diff --git a/.gitignore b/.gitignore
index a2b15b6..7977ba7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -164,3 +164,6 @@ cython_debug/
 .idea/
 
 # testing/fidling script:
+
+# MacOS
+.DS_Store
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 948a9f7..8d34243 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 All notable changes to the Aptos Python SDK will be captured in this file. This changelog is written by hand for now.
 
+## Unreleased
+
+- **[Breaking Change]**: `ed25519` and `secp256k1` private key's `__str__` will now return the AIP-80 compliant string
+
 ## 0.11.0
 
 - `PrivateKey.format_private_key` can now format a AIP-80 compliant private key
diff --git a/aptos_sdk/ed25519.py b/aptos_sdk/ed25519.py
index 93437db..de5dde2 100644
--- a/aptos_sdk/ed25519.py
+++ b/aptos_sdk/ed25519.py
@@ -26,7 +26,7 @@ def __eq__(self, other: object):
         return self.key == other.key
 
     def __str__(self):
-        return self.hex()
+        return self.aip80()
 
     @staticmethod
     def from_hex(value: str | bytes, strict: bool | None = None) -> PrivateKey:
@@ -325,6 +325,13 @@ def test_private_key_from_str(self):
             private_key_bytes.hex(),
         )
 
+    def test_private_key_aip80_formatting(self):
+        private_key_with_prefix = "ed25519-priv-0x4e5e3be60f4bbd5e98d086d932f3ce779ff4b58da99bf9e5241ae1212a29e5fe"
+        self.assertEqual(
+            str(PrivateKey.from_str(private_key_with_prefix, True)),
+            private_key_with_prefix,
+        )
+
     def test_sign_and_verify(self):
         in_value = b"test_message"
 
diff --git a/aptos_sdk/secp256k1_ecdsa.py b/aptos_sdk/secp256k1_ecdsa.py
index aa8ff1b..a5bf7b7 100644
--- a/aptos_sdk/secp256k1_ecdsa.py
+++ b/aptos_sdk/secp256k1_ecdsa.py
@@ -27,7 +27,7 @@ def __eq__(self, other: object):
         return self.key == other.key
 
     def __str__(self):
-        return self.hex()
+        return self.aip80()
 
     @staticmethod
     def from_hex(value: str | bytes, strict: bool | None = None) -> PrivateKey:
@@ -63,7 +63,7 @@ def hex(self) -> str:
 
     def aip80(self) -> str:
         return PrivateKey.format_private_key(
-            self.hex(), asymmetric_crypto.PrivateKeyVariant.Ed25519
+            self.hex(), asymmetric_crypto.PrivateKeyVariant.Secp256k1
         )
 
     def public_key(self) -> PublicKey:
@@ -221,6 +221,13 @@ def test_private_key_from_str(self):
             private_key_bytes.hex(),
         )
 
+    def test_private_key_aip80_formatting(self):
+        private_key_with_prefix = "secp256k1-priv-0x306fa009600e27c09d2659145ce1785249360dd5fb992da01a578fe67ed607f4"
+        self.assertEqual(
+            str(PrivateKey.from_str(private_key_with_prefix, True)),
+            private_key_with_prefix,
+        )
+
     def test_vectors(self):
         private_key_hex = "secp256k1-priv-0x306fa009600e27c09d2659145ce1785249360dd5fb992da01a578fe67ed607f4"
         public_key_hex = "0x04210c9129e35337ff5d6488f90f18d842cf985f06e0baeff8df4bfb2ac4221863e2631b971a237b5db0aa71188e33250732dd461d56ee623cbe0426a5c2db79ef"