diff --git a/core/src/apps/common/coininfo.py b/core/src/apps/common/coininfo.py
index a752fd531d..4ced81a933 100644
--- a/core/src/apps/common/coininfo.py
+++ b/core/src/apps/common/coininfo.py
@@ -68,7 +68,7 @@ class CoinInfo:
         if curve_name == "secp256k1-groestl":
             self.b58_hash = groestl512d_32
             self.sign_hash_double = False
-            self.script_hash: type[utils.HashContext] = sha256_ripemd160
+            self.script_hash: type[utils.HashContextInitable] = sha256_ripemd160
         elif curve_name == "secp256k1-decred":
             self.b58_hash = blake256d_32
             self.sign_hash_double = False
diff --git a/core/src/apps/common/coininfo.py.mako b/core/src/apps/common/coininfo.py.mako
index d18adb0175..03b761f00c 100644
--- a/core/src/apps/common/coininfo.py.mako
+++ b/core/src/apps/common/coininfo.py.mako
@@ -68,7 +68,7 @@ class CoinInfo:
         if curve_name == "secp256k1-groestl":
             self.b58_hash = groestl512d_32
             self.sign_hash_double = False
-            self.script_hash: type[utils.HashContext] = sha256_ripemd160
+            self.script_hash: type[utils.HashContextInitable] = sha256_ripemd160
         elif curve_name == "secp256k1-decred":
             self.b58_hash = blake256d_32
             self.sign_hash_double = False
diff --git a/core/src/trezor/utils.py b/core/src/trezor/utils.py
index df091bdde3..168f29de75 100644
--- a/core/src/trezor/utils.py
+++ b/core/src/trezor/utils.py
@@ -145,17 +145,18 @@ def chunks_intersperse(items: str, size: int, sep: str = "\n") -> Iterator[str]:
 if TYPE_CHECKING:
 
     class HashContext(Protocol):
-        def __init__(  # pylint: disable=super-init-not-called
-            self, __data: bytes = None
-        ) -> None:
-            ...
-
         def update(self, __buf: bytes) -> None:
             ...
 
         def digest(self) -> bytes:
             ...
 
+    class HashContextInitable(HashContext, Protocol):
+        def __init__(  # pylint: disable=super-init-not-called
+            self, __data: bytes = None
+        ) -> None:
+            ...
+
     class Writer(Protocol):
         def append(self, __b: int) -> None:
             ...