diff --git a/contrib/requirements/requirements.txt b/contrib/requirements/requirements.txt
index 529b3882f..cab0782d7 100644
--- a/contrib/requirements/requirements.txt
+++ b/contrib/requirements/requirements.txt
@@ -10,3 +10,4 @@ aiohttp>=3.3.0
 aiohttp_socks
 certifi
 bitstring
+pycryptodomex>=3.7
diff --git a/electrum/lnonion.py b/electrum/lnonion.py
index 5a3f3d18b..7ab842056 100644
--- a/electrum/lnonion.py
+++ b/electrum/lnonion.py
@@ -23,17 +23,11 @@
 # CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 # SOFTWARE.
 
-import sys
 import hashlib
 from typing import Sequence, List, Tuple, NamedTuple, TYPE_CHECKING
 from enum import IntEnum, IntFlag
+from Cryptodome.Cipher import ChaCha20
 
-try:
-    from Cryptodome.Cipher import ChaCha20
-except Exception as e:
-    print(e)
-    print("Error: pycryptodomex >= 3.7 not available.")
-    sys.exit(1)
 
 from . import ecc
 from .crypto import sha256, hmac_oneshot
diff --git a/electrum/lntransport.py b/electrum/lntransport.py
index a51e208fd..88c26f839 100644
--- a/electrum/lntransport.py
+++ b/electrum/lntransport.py
@@ -5,16 +5,9 @@
 
 # Derived from https://gist.github.com/AdamISZ/046d05c156aaeb56cc897f85eecb3eb8
 
-import sys
 import hashlib
 from asyncio import StreamReader, StreamWriter
-
-try:
-    from Cryptodome.Cipher import ChaCha20_Poly1305
-except Exception as e:
-    print(e)
-    print("Error: pycryptodomex >= 3.7 not available.")
-    sys.exit(1)
+from Cryptodome.Cipher import ChaCha20_Poly1305
 
 from .crypto import sha256, hmac_oneshot
 from .lnutil import (get_ecdh, privkey_to_pubkey, LightningPeerConnectionClosed,
diff --git a/setup.py b/setup.py
index 409664742..d0ce0fbf3 100755
--- a/setup.py
+++ b/setup.py
@@ -52,7 +52,6 @@ if platform.system() in ['Linux', 'FreeBSD', 'DragonFly']:
 
 extras_require = {
     'hardware': requirements_hw,
-    'fast': ['pycryptodomex'],
     'gui': ['pyqt5'],
 }
 extras_require['full'] = [pkg for sublist in list(extras_require.values()) for pkg in sublist]