diff --git a/crates/ruff/src/rules/pyupgrade/rules/f_strings.rs b/crates/ruff/src/rules/pyupgrade/rules/f_strings.rs
index 462b3c5f81f890..b40a330373d827 100644
--- a/crates/ruff/src/rules/pyupgrade/rules/f_strings.rs
+++ b/crates/ruff/src/rules/pyupgrade/rules/f_strings.rs
@@ -104,8 +104,9 @@ impl<'a> FormatSummaryValues<'a> {
     }
 
     fn arg_auto(&mut self) -> Option<&Expr> {
+        let arg = self.arg_positional(self.auto_index);
         self.auto_index += 1;
-        self.arg_positional(self.auto_index - 1)
+        arg
     }
 
     fn arg_positional(&mut self, index: usize) -> Option<&Expr> {