From e6d03ba97fe8e9914ba2bc2202a5ba82d101db40 Mon Sep 17 00:00:00 2001
From: Tyler Goodlet <jgbt@protonmail.com>
Date: Wed, 1 Jun 2022 14:42:39 -0400
Subject: [PATCH] Add missing f-str prefix

---
 piker/clearing/_ems.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/piker/clearing/_ems.py b/piker/clearing/_ems.py
index e00676f2..17f9be1a 100644
--- a/piker/clearing/_ems.py
+++ b/piker/clearing/_ems.py
@@ -80,7 +80,9 @@ def mk_check(
 
         return check_lt
 
-    raise ValueError('trigger: {trigger_price}, last: {known_last}')
+    raise ValueError(
+        f'trigger: {trigger_price}, last: {known_last}'
+    )
 
 
 @dataclass