diff --git a/crates/ruff_python_literal/src/format.rs b/crates/ruff_python_literal/src/format.rs
index 96f724ad2c8504..4d34f96bb0bf80 100644
--- a/crates/ruff_python_literal/src/format.rs
+++ b/crates/ruff_python_literal/src/format.rs
@@ -1078,9 +1078,9 @@ impl FormatString {
                     left.push(c);
                     continue;
                 }
-                let (_, right) = text.split_at(idx);
+                let (_, right) = text.split_at(idx + 1);
                 let format_part = FormatString::parse_part_in_brackets(&left)?;
-                return Ok((format_part, &right[1..]));
+                return Ok((format_part, &right));
             } else {
                 left.push(c);
             }
@@ -1478,6 +1478,10 @@ mod tests {
             FormatSpec::parse("}"),
             Err(FormatSpecError::InvalidFormatType)
         );
+        assert_eq!(
+            FormatSpec::parse("{}}"),
+            Err(FormatSpecError::InvalidFormatType)
+        );
         assert_eq!(
             FormatSpec::parse("{{x}}"),
             Err(FormatSpecError::InvalidPlaceholder(