diff --git a/setup.cfg b/setup.cfg
index a148aca10..32b083460 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -26,7 +26,7 @@ line_length = 88
 not_skip=__init__.py
 forced_separate = apps
 known_standard_library = micropython,ubinascii,ustruct,uctypes,utime,utimeq,trezorio,trezorui,trezorutils,trezorconfig
-known_third_party = curve25519,ecdsa,hypothesis,pytest,mnemonic
+known_third_party = curve25519,ecdsa,hypothesis,pytest,mnemonic,shamir-mnemonic
 known_first_party = trezorlib
 
 [tool:pytest]