diff --git a/electrum/tests/__init__.py b/electrum/tests/__init__.py
index 72a3d2d6b..7d1d336d3 100644
--- a/electrum/tests/__init__.py
+++ b/electrum/tests/__init__.py
@@ -8,7 +8,7 @@ from electrum import constants
 # If set, unit tests that would normally test functions with multiple implementations,
 # will only be run once, using the fastest implementation.
 # e.g. libsecp256k1 vs python-ecdsa. pycryptodomex vs pyaes.
-FAST_TESTS = 1
+FAST_TESTS = False
 
 
 # some unit tests are modifying globals; sorry.